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/main.js

@@ -1,73 +0,0 @@
-// polyfills
-import '@babel/polyfill';
-
-import $ from 'jquery';
-import './utils/remodal';
-import 'simplebar/dist/simplebar.min.js';
-import { UriToMarkdown } from './forms/fields/files.js';
-import GPM, { Instance as gpm } from './utils/gpm';
-import KeepAlive from './utils/keepalive';
-import Updates, { Instance as updates, Notifications, Feed } from './updates';
-import Dashboard from './dashboard';
-import Pages from './pages';
-import Forms from './forms';
-import Cookies from './utils/cookies';
-import './plugins';
-import './themes';
-import MediaFilter, { Instance as MediaFilterInstance} from './media';
-import toastr from './utils/toastr';
-import request from './utils/request';
-import './utils/2fa';
-import './tools';
-import './whitelabel';
-
-// bootstrap jQuery extensions
-import './utils/bootstrap-transition';
-import './utils/bootstrap-collapse';
-import './utils/bootstrap-dropdown';
-
-// tabs memory
-import './utils/tabs-memory';
-
-// changelog
-import './utils/changelog';
-
-// Main Sidebar
-import Sidebar, { Instance as sidebar } from './utils/sidebar';
-
-// starts the keep alive, auto runs every X seconds
-KeepAlive.start();
-
-// global event to catch sidebar_state changes
-$(global).on('sidebar_state._grav', () => {
-    Object.keys(Dashboard.Chart.Instances).forEach((chart) => {
-        setTimeout(() => Dashboard.Chart.Instances[chart].chart.update(), 10);
-    });
-});
-
-export default {
-    GPM: {
-        GPM,
-        Instance: gpm
-    },
-    KeepAlive,
-    Dashboard,
-    Pages,
-    Forms,
-    Updates: {
-        Updates,
-        Notifications,
-        Feed,
-        Instance: updates
-    },
-    Sidebar: {
-        Sidebar,
-        Instance: sidebar
-    },
-    MediaFilter: {
-        MediaFilter,
-        Instance: MediaFilterInstance
-    },
-    Scrollbar: { Scrollbar: { deprecated: true }, Instance: { deprecated: true } },
-    Utils: { request, toastr, Cookies, UriToMarkdown }
-};