[docs] adding config docs
[debugging] adding debuggin docs
[dev_res] adding plugin contribution docs
[dev_res] updating api docs
[debugging] removing common errors portion
[dev_res] moved this doc to developer -> api
[intro] updating formatting
[signing] updating android formatting
[index] adding hydration docs
[tools] adding hydration doc
[introduction] adding upgrade docs
[debugging] updating formatting
[tools] formatting hydration docs
[intro] formatting upgrade doc