Refactor data handlers + misc fixes

This refactors the data handlers into a more standard/understood model-like architecture, to prepare for a new, more robust config system.

It also fixes a problem with creating new Notes and uploading new Photos via the web interface (related to #58).

Finally, it speeds up docker builds by sending in less files, which aren't necessary or will be built anyway.

This is all in preparation to allow building #13 more robustly.

routes/api/files/search.tsx

@@ -1,7 +1,7 @@
 import { Handlers } from 'fresh/server.ts';
 
 import { Directory, DirectoryFile, FreshContextState } from '/lib/types.ts';
-import { searchFilesAndDirectories } from '/lib/data/files.ts';
+import { searchFilesAndDirectories } from '/lib/models/files.ts';
 
 interface Data {}