precommit git hooks, rearrange package structure (#251)

* precommit hooks and changes because of these
* mv package into src dir
* add requirements file, clean up setup reqs, add precommit to CI

.gitignore

@@ -12,10 +12,10 @@ dist
 .vscode
 
 generated
-domdiv/fonts/*.otf
-domdiv/fonts/*.ttf
+src/domdiv/fonts/*.otf
+src/domdiv/fonts/*.ttf
 dominion_dividers.pdf
 dominion_dividers.png
 tools/card_db
 
-.mypy_cache/
+.mypy_cache/