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 issue #16 -
Add styles via sass and module imports
Adds typed scss imports via gatsby-plugin-sass.
Makes use of .d.scss file generated by gatsby-plugin-scss-typescript,
but avoids importing that directly while they work out issue in gatsby v3.
* adding vscode config for easier local debugging
