Adding Linting and Formatting (#77)

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

client/.eslintrc.js

@@ -0,0 +1,30 @@
+module.exports = {
+  'env': {
+    'browser': true,
+    'es2021': true,
+    'node': true,
+  },
+  'extends': [
+    'plugin:react/recommended',
+    'google',
+  ],
+  'parser': '@typescript-eslint/parser',
+  'parserOptions': {
+    'ecmaFeatures': {
+      'jsx': true,
+    },
+    'ecmaVersion': 12,
+    'sourceType': 'module',
+  },
+  'plugins': [
+    'react',
+    '@typescript-eslint',
+  ],
+  'rules': {
+  },
+  'settings': {
+    'react': {
+      'version': 'detect',
+    },
+  },
+};