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/admin/themes/grav/app/tools/index.js

@@ -1 +0,0 @@
-import './logs';

plugins/admin/themes/grav/app/tools/logs.js

@@ -1,14 +0,0 @@
-import $ from 'jquery';
-import { setParam } from 'mout/queryString';
-
-const prepareQuery = (key, value) => {
-    return setParam(global.location.href, key, value);
-};
-
-$(document).on('change', '.logs-content .block-select select[name]', (event) => {
-    const target = $(event.currentTarget);
-    const name = target.attr('name');
-    const value = target.val();
-
-    global.location.href = prepareQuery(name, value);
-});