WIP: Add page get-in-touch

Instead of adding !63 with a batch changes, I propose to split this into smaller merges. !63 wants to create three new pages:

• /support
• /support/get-in-touch
• /support/glossary

and it wants to move /how-it-works to /support/how-it-works

In order to fit all the new pages into the menu, !63 creates a submenu "Support".

This MR only adds the get-in-touch page and moves /how-it-works to /support/how-it-works

For the missing /support index page, it adds a copy of how-it-works (symlink) to be later replaces with the real index page (the FAQs)

EDIT: I think it would make sense to break this apart into even smaller pieces, adding the invidiual pages from !63 one by one and only later adding the menu restructuring.