* More WebSub doc
* UI for WebSub + more documentation
And spellcheck Frech
* Links to WebSub doc from readme
* Add link to WebSub doc in admin interface
* Fix checkbox
* Plural
* Improved markdownlint
* Relaxed rules slighlty
* `npm run markdownlint` for automatic tests
* `npm run markdownlint_fix` for automatic syntax fixing
* Applied the fixes on all our Markdown files