typo removed

See merge request !1

- added more langs to fenced code blocks

- added lang to some fenced code blocks
- added better explanation for LoginExternalFirstTimeSite

- added lang to bash code

- added some steps to install guide

- added some docs about the multi tab editor and the ace storage

  - added some hints for the static pages that has strong references to login

- added docs for adding a communication layer
- moved communication docs

- mentioned cors

- added validation docs

- added better list rendering docs

- question system docs
- added inner structure docs

- added addeding markdown clode block langs docs

- finished frontend setup guides (deploy & develop)

- added used frontend frameworks