Addresses #11 item "Linting/formatting (eg eslnt, prettier)":
* Adding eslint, prettier, and config targeting Google, typescript, and both nodejs and client builds
* Addressing linter-found issues
* Adding lint and lint:fix commands
* Adding documentation
* Renaming workflow and adding lint check
* Adding documentation about VSCode linting/formatting, ran formatting on a few files, set up exclude list for gatsby develop, setup build to fail on error
Addresses #58 , "As a member of the public, I want to see J40's website live on the internet, so that I know it's real!" - hosting on github pages for now as a temporary measure. This fix does NOT: 1) add .gov domain hosting, or 2) post to the geoplatform s3 bucket. This will need to happen in a subsequent fix.
The changes made specifically to enable this for now:
* Adding github action to build, test, and deploy on pushes to client/
* Adding path prefix to build gh-pages at https://usds.github.io/justice40-tool/
* (Temporarily) pointing to fix branch for trussworks to enable SSR building
* Removing the workaround for the above bug in gatsby-node.js
* Setting build target to be 14.x due to version number limitations
* Adding gh-pages dependency, deploy action for manual deploy
* Force renaming J40header -> J40Header and J40footer -> J40Footer due to Linux case sensitivity
