after_store: Remove most of StatusNet config usage

Information under `pleromafe` key is equivalent to the one under
`pleroma_fe` key in  `/api/pleroma/frontend_configurations`.

All other information had equivalents in `/nodeinfo/2.0.json`, except
`textlimit` and `vapidPublicKey`.
3 jobs for remove-twitterapi-config in 7 minutes and 9 seconds (queued for 1 second)
Status Job ID Name Coverage
  Lint
passed #103208
lint

00:02:17

 
  Build
passed #103209
build

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  Test
passed #103210
test

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