Refactorings and Searchable layer indices

This PR contains a couple of things:

- Refactorings by adapting some file pathes, removing unneeded files and indices
- Small adaptions to deployment (without effects, but untested)
- Small adaptions to the makefile

Also, all searchable layers (as defined in [1]) are now containing indices. Note that those indices now exist on our test instance.

There are still troubles with some indices because of missing functions in the database. I will adapt this once it's clear how this is done. Once adapted, more changes (in sepearte PR) are needed.

Note: the indices should now contain everything that is needed for our go-live on october 18. It would that 2 people verify the creationg of all indices to assure the right dbs/tables/views/columns are taken to create the indices.

Note: queryable only layers are not created yet (they are only needed in feature tree, which is not part of first go-live)