fix(gatsby): Remove `react-hot-loader` deps & other unused deps (#29864)#29876

Merged

vladar merged 2 commits intorelease/3.0from backport-3.0-29864

Mar 1, 2021

+15-42

Commits on Mar 1, 2021

fix(gatsby): Remove react-hot-loader deps & other unused deps (#29864 )

LekoArts
authored and
vladar
committed
Merge branch 'release/3.0' of https://github.com/gatsbyjs/gatsby into backport-3.0-29864
vladar
committed