Bootstrap 5 & remove jQuery (#661)

* build: move frontend assets to Bootstrap 5.3 and Tom Select

* feat: migrate templates and scripts to Bootstrap 5, dropping jQuery

Templates
- Rename Bootstrap 4 classes and data attributes (data-bs-*, ms-/me-/ps-/pe-,
  text-start/end, form-group -> mb-3, input-group wrappers removed, badges,
  custom controls -> form-check/form-select, media -> d-flex, btn-close, ...)
- Dark mode now uses Bootstrap 5.3 colour modes (data-bs-theme on <html>),
  set from <head> to avoid a flash of the light theme
- Remove the Bootstrap 4 /bootstrap/ demo page
- Contextual table classes (table-success etc.) still work as plain
  backgrounds for the rigboard key

JavaScript
- Remove jQuery: src.js/interaction.js and every inline template script are
  rewritten in plain JS on top of small helpers (helpers.js, bundled with
  Bootstrap into jpop.js so inline scripts can use them)
- Replace bootstrap-select/ajax-bootstrap-select with Tom Select. The remote
  search now sends the `q` parameter and reads `text`, which is what the
  API actually uses (the old picker sent `term` and read `label`)
- HTML fragments are fetched with an X-Requested-With header so views keep
  rendering their modal variants, and fetched scripts are re-executed
- Remove the Bootstrap 4 plugin script includes

* fix: stop rigboard header buttons stretching to full width under Bootstrap 5

* fix: restore dark-mode brand colours and contextual table colours under Bootstrap 5

* fix: brighten dark-mode links and make coloured card outlines visible

* fix: calendar layout and grid borders, navbar search button width, guard missing modal links

* fix: readable text in dark-mode Tom Select inputs and placeholders, restore form-control column widths

* build: split the Dockerfile into cached stages with prod and dev targets

* deploy: make compose.yml development-only with live reload, and document it

* fix: keep badge text colour for links inside badges

* fix: restore table-bordered grid lines in dark mode

* fix: include Bootstrap's progress styles and keep progress labels readable

templates/partials/associated_organisations.html

@@ -3,7 +3,7 @@
         <div class="card-header">Associated Organisations</div>
         <ul class="list-group list-group-flush">
             {% for organisation,count in object.organisations %}
-                <a class="list-group-item list-group-item-action" href="{% url 'organisation_detail' organisation.pk %}">{{ organisation.pk|stringformat:"05d" }} | {{ organisation.name }} <span class="badge badge-secondary" title="{{count}} events with {{object.name}} for {{organisation.name}}">{{count}}</span></a>
+                <a class="list-group-item list-group-item-action" href="{% url 'organisation_detail' organisation.pk %}">{{ organisation.pk|stringformat:"05d" }} | {{ organisation.name }} <span class="badge text-bg-secondary" title="{{count}} events with {{object.name}} for {{organisation.name}}">{{count}}</span></a>
             {% endfor %}
         </ul>
     </div>

templates/partials/button.html

@@ -3,9 +3,9 @@
 {% elif pk %}
 <a href="{% url target pk %}" class="btn {{ class }}" {% if id %}id="{{id}}"{%endif%} {% if style %}style="{{style}}"{%endif%} {% if text == 'Print' %}target="_blank"{%endif%}><span class="fas {{ icon }} align-middle"></span> <span class="d-none d-sm-inline align-middle">{{ text }}</span></a>
 {% elif copy %}
-<button class="btn btn-secondary btn-sm mr-1" data-clipboard-target="{{id}}" data-content="Copied to clipboard!"><span class="fas fa-copy"></span></button>
+<button class="btn btn-secondary btn-sm me-1" data-clipboard-target="{{id}}" data-bs-content="Copied to clipboard!"><span class="fas fa-copy"></span></button>
 {% elif today %}
-<button class="btn btn-info col-sm-2" onclick="var date = new Date(); $('#{{id}}').val([date.getFullYear(), ('0' + (date.getMonth()+1)).slice(-2), ('0' + date.getDate()).slice(-2)].join('-'))" tabindex="-1" type="button">Today</button>
+<button class="btn btn-info col-sm-2" onclick="document.getElementById('{{id}}').value = new Date().getISOString()" tabindex="-1" type="button">Today</button>
 {% else %}
 <a href="{% url target %}" class="btn {{ class }}" {% if id %}id="{{id}}"{%endif%} {% if style %}style="{{style}}"{%endif%}><span class="fas {{ icon }} align-middle"></span> <span class="d-none d-sm-inline align-middle">{{ text }}</span></a>
 {% endif %}

templates/partials/dark_theme.html

@@ -1,7 +1,5 @@
-{% load static %}
 <script>
-if({{ request.user.dark_theme|lower|default:'false' }} || window.matchMedia('(prefers-color-scheme: dark)').matches) {
-    document.querySelector('head').innerHTML += '<link rel="stylesheet" href="{% static "css/dark_screen.css" %}" type="text/css"/>';
-    document.body.setAttribute('data-theme', 'dark');
+if ({{ request.user.dark_theme|lower|default:'false' }} || window.matchMedia('(prefers-color-scheme: dark)').matches) {
+    document.documentElement.setAttribute('data-bs-theme', 'dark');
 }
 </script>

templates/partials/form_field.html

@@ -5,15 +5,11 @@
 {% if append or prepend %}
 <div class="input-group {{col}} flex-nowrap">
   {% if prepend %}
-  <div class="input-group-prepend">
-    <span class="input-group-text">{{ prepend }}</span>
-  </div>
+  <span class="input-group-text">{{ prepend }}</span>
   {% endif %}
   {% render_field field|add_class:'form-control' style=style %}
   {% if append %}
-  <div class="input-group-append">
-    <span class="input-group-text">{{ append }}</span>
-  </div>
+  <span class="input-group-text">{{ append }}</span>
   {% endif %}
 </div>
 {% else %}

templates/partials/list_search.html

@@ -1,12 +1,12 @@
 {% load button from filters %}
 <div class="row">
     <div class="col">
-        <form class="form-inline justify-content-end">
+        <form class="d-flex align-items-center flex-wrap gap-2 justify-content-end">
             {% csrf_token %}
             <div class="input-group">
                 <input type="search" name="q" placeholder="Search" value="{{ request.GET.q }}"
                        class="form-control" id="id_search_text"/>
-                <span class="input-group-append">{% button 'search' id="id_search" %}</span>
+                {% button 'search' id="id_search" %}
             </div>
         </form>
     </div>

templates/partials/search.html

@@ -1,11 +1,9 @@
 {% if user.is_authenticated %}
-<form id="searchForm" class="form-inline flex-nowrap mx-md-3 px-2 border border-light rounded" role="form" method="GET" action="{% url 'search' %}">
+<form id="searchForm" class="d-flex align-items-center flex-wrap gap-2 flex-nowrap mx-md-3 px-2 border border-light rounded" role="form" method="GET" action="{% url 'search' %}">
     <div class="input-group">
         <input id="id_search_input" type="search" name="q" class="form-control form-control-sm" placeholder="Search..." value="{{ request.GET.q }}" />
-        <div class="input-group-append">
-            <button class="btn btn-info form-control form-control-sm btn-sm"><span class="fas fa-search"></span><span class="sr-only"> Search</span></button>
-        </div>
+        <button class="btn btn-info btn-sm"><span class="fas fa-search"></span><span class="visually-hidden"> Search</span></button>
     </div>
-    <a href="{% url 'search_help' %}" class="nav-link modal-href ml-1"><span class="fas fa-question-circle"></span></a>
+    <a href="{% url 'search_help' %}" class="nav-link modal-href ms-1"><span class="fas fa-question-circle"></span></a>
 </form>
 {% endif %}