Static directory must implicitly be called "static" in any case even if derivation

[augyg]

For any obelisk project where static is a derivation the staticFiles attribute implicitly needs to be

staticFiles = import ./static {inherit pkgs;};

where the filepath can only be ./static

if the folder passed to import was ./static2 or something else, the static derivation watcher watchStaticFilesDerivation will ignore it

https://github.com/obsidiansystems/obelisk/blob/master/lib/command/src/Obelisk/Command/Project.hs#L470-L475

[augyg]

#1112

I will fix as part of this PR