porygon: Use GET instead of POST for search queries
porygon: Do not use any parser plugin
indexer: Remove ID(fullpath) field

It seems to have been introduced with no reason in
commit 3886587f2b042dc3eb1a9a5b1d3e38f18fce3364.
Remove unused parallel library

It has been unused since commit
4f9dfe96bf4097ae8f3e32ec400f30cd67f551db.
Remove unfinished favicon