Try to get the `.editorconfig` and `.prettierrc` files as close as possible
to the formatting that was used in Flamenco. Because these files weren't
here during most of Flamenco's development so far, having them caused quite
a few changes in the webapp files.
No functional changes intended.
Rename the add-on from `flamenco3-addon.zip` to `flamenco-addon.zip`.
It still contains the same files as before, and in Blender the name of
the add-on has not changed.
If there are no jobs in the database yet, show a "get the addon" call to
action. This includes the current API URL, which can be copied by clicking
on it.
There is no feedback yet that the copy took place, though.
