Remove Sentry/GlitchTip integration

- main.js: drop @sentry/browser + @sentry/vue init.
- webpack.config.prod.js: drop sentryWebpackPlugin (and its dotenv/env
  plumbing that only served Sentry release/source-map upload).
- package.json: remove @sentry/browser, @sentry/vue, @sentry/webpack-plugin.

Note: run 'npm install' to update package-lock before the next build.

web/themes/custom/materiotheme/assets/scripts/main.js

@@ -62,40 +62,6 @@ import 'theme/assets/styles/print.scss'
 
 import MA from 'vuejs/api/ma-axios'
 
-import * as Sentry from '@sentry/browser'
-import * as VueSentry from '@sentry/vue'
-
-Sentry.init({
-  dsn: 'https://7c0e73518188407d9d1f1b1f1f87d457@frontlog.figli.io/3',
-  // release: "",
-  integrations: [
-    Sentry.browserTracingIntegration()
-    // Sentry.replayIntegration(),
-  ],
-  tracesSampleRate: 1.0
-  // Set `tracePropagationTargets` to control for which URLs trace propagation should be enabled
-  // tracePropagationTargets: ["localhost", /^https:\/\/yourserver\.io\/api/],
-  // // Capture Replay for 10% of all sessions,
-  // // plus for 100% of sessions with an error
-  // // Learn more at
-  // // https://docs.sentry.io/platforms/javascript/session-replay/configuration/#general-integration-configuration
-  // replaysSessionSampleRate: 0.1,
-  // replaysOnErrorSampleRate: 1.0,
-})
-
-// setTimeout(() => {
-//   throw new Error('Sentry Test Error')
-// })
-
-VueSentry.init({
-  Vue,
-  dsn: 'https://7c0e73518188407d9d1f1b1f1f87d457@frontlog.figli.io/3',
-  integrations: [
-  ]
-  // Set `tracePropagationTargets` to control for which URLs trace propagation should be enabled
-  // tracePropagationTargets: ["localhost", /^https:\/\/yourserver\.io\/api/],
-})
-
 export let _v_sitebranding_block, _v_user_block, _v_header_menu, _v_language_switcher,
   _v_pagetitle_block, _v_search_block,
   _v_main_content, _v_left_content,