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/utils/2fa.js

@@ -1,32 +0,0 @@
-import $ from 'jquery';
-import { config } from 'grav-config';
-import request from '../utils/request';
-
-const body = $('body');
-
-// Dashboard update and Grav update
-body.on('click', '[data-2fa-regenerate]', function(event) {
-    event.preventDefault();
-    let element = $(this);
-    let url = `${config.base_url_relative}/ajax.json/task${config.param_sep}regenerate2FASecret`;
-
-    element.attr('disabled', 'disabled').find('> .fa').addClass('fa-spin');
-
-    request(url, { method: 'post' }, (response) => {
-        $('[data-2fa-image]').attr('src', response.image);
-        $('[data-2fa-secret]').text(response.secret);
-        $('[data-2fa-value]').val(response.secret.replace(/ /g, ''));
-
-        element.removeAttr('disabled').find('> .fa').removeClass('fa-spin');
-    });
-});
-
-const toggleSecret = () => {
-    const toggle = $('#toggle_twofa_enabled1');
-    const secret = $('.twofa-secret');
-
-    secret[toggle.is(':checked') ? 'addClass' : 'removeClass']('show');
-};
-
-body.on('click', '.twofa-toggle input', toggleSecret);
-toggleSecret();