Create a dedicated package `.../pkg/website` to contain constants for the
URLs of documentation, bug reporting, etc. That way it's easier to see
which parts of the website are being referred to from the Flamenco
binaries, and updates can happen in a central spot.
No functional changes.
Change the package base name of the Go code, from
`git.blender.org/flamenco` to `projects.blender.org/studio/flamenco`.
The old location, `git.blender.org`, has no longer been use since the
[migration to Gitea][1]. The new package names now reflect the actual
location where Flamenco is hosted.
[1]: https://code.blender.org/2023/02/new-blender-development-infrastructure/
Blender not being found can be reported via various errors (this should be
reworked in the 'blender finder API' at some point). `exec.ErrNotFound` is
returned when Blender cannot be found on `$PATH`, which is something that's
absolutely fine. This is now logged less dramatically.
Avoid the word "error" in logging when Blender cannot be found. Typically
these are warnings, and having the word "error" there makes people think
otherwise.
