Document dev server hot keys/shortcuts

[delucis]

The Astro dev server supports several shortcuts you can use from the terminal while it is running, but this is not currently documented. Historically these were not super important but with the advent of content layer, the s shortcut is being recommended more frequently to re-sync the content layer in the case of dodgy caching.

With the dev server running you can h then enter to display available shortcuts. At time of writing, this logs:

  Press s + enter to sync content layer
  Press o + enter to open in browser
  Press q + enter to quit

[Adammatthiesen]

Would be very helpful... good to know q+enter actually does close the server.

[anaxite]

Agreed; if these shortcuts are not planned for removal, then it's useful to describe.

[sarah11918]

Promoted to issue! #11516