Move plugins to manifest, pin Docker version, add Makefile

- Add plugins.txt listing all plugins for reproducible installs
- Add Makefile with setup/start/stop/install-plugins targets
- Remove user/plugins/ from git tracking
- Pin Docker image to 1.7.49.5-ls244

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/form/templates/forms/fields/display/display.html.twig

@@ -1,21 +0,0 @@
-{% extends "forms/field.html.twig" %}
- 
-{% if field.file %}
-    {% set content = read_file(field.file) %}
-{% else %}
-    {% set content = field.content %}
-{% endif %}
-
-{% block input %}
-    <div class="form-display-wrapper {{ field.size }} {{ field.classes }}" {% if field.id is defined %}id="{{ field.id|e }}" {% endif %}>
-        {% if field.markdown %}
-            {{ content|t|markdown|raw }}
-        {% else %}
-            {% if field.evaluate %}
-              {{ evaluate_twig(content)|raw }}
-            {% else %}
-              {{ content|t|raw }}
-            {% endif %}
-        {% endif %}
-    </div>
-{% endblock %}