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/honeypot/honeypot.html.twig

@@ -1,15 +0,0 @@
-{% extends "forms/field.html.twig" %}
-
-{% block field %}
-{% set input_value = value is iterable ? value|join(',') : value|string %}
-<input aria-hidden="true"
-       type="text"
-       {% if config.plugins.form.inline_css == true %}
-       style="visibility:hidden;position:absolute!important;height:1px;width:1px;overflow:hidden;clip:rect(1px,1px,1px,1px);"
-       {% endif %}
-       class="form-honeybear"
-       tabindex="-1"
-       autocomplete="off"
-       name="{{ (scope ~ field.name)|fieldName }}"
-       value="{{ input_value|e }}" />
-{% endblock %}