Update JS dependencies and misc tweaks (#13741)

* Update JS dependencies and misc tweaks

- Update all JS dependencies minus webpack
- Adapt CodeMirrors styling to new CSS parent introduced by EasyMDE
- Set eslint parser to latest and add new eslint 7.14 rule
- Speed up npm install by disabling audit and fund checks
- Move fomantic-ui to optional dependencies to further speed up npm
- Enable syntax highlighting on GH for .eslintrc and .stylelintrc
- Makefile cleanups

* disable audit in npmrc

* add missing dash

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

.eslintrc

@@ -9,7 +9,7 @@ ignorePatterns:
 
 parserOptions:
   sourceType: module
-  ecmaVersion: 2020
+  ecmaVersion: 2021
 
 plugins:
   - eslint-plugin-unicorn
@@ -235,6 +235,7 @@ rules:
   no-new-symbol: [2]
   no-new-wrappers: [2]
   no-new: [0]
+  no-nonoctal-decimal-escape: [2]
   no-obj-calls: [2]
   no-octal-escape: [2]
   no-octal: [2]