Docs: Updated installation instruction for devs
Ignoring: settings files (.gitignore in their dir)

I put .gitignore in directory containing settings files, which ignores
non-dist versions of settings for both "normal" and LDAP setting files.
Getting rid of mentions of 'end_user.py'
Merge branch 'pbanaszkiewicz-fix_documentation_15105' into develop

* pbanaszkiewicz-fix_documentation_15105:
  Getting rid of mentions of 'end_user.py'
  Ignoring: settings files (.gitignore in their dir)
  Docs: Updated installation instruction for devs