Better Linting

[awhigham9]

We need to specify some stricter linting rules. There is no specific set of rules in mind, but any more comprehensive rule-set from the TypeScript development community would probably do.

We also need to add a npm run lint and npm run lint-fix command to the package.json. These should be:

"scripts": {
  // other commands. . .
  "lint": "eslint . --ext .ts,.tsx",
  "lint-fix": "eslint . --ext .ts,.tsx --fix"
 }

Lastly, we should add a PR workflow check which runs linting and blocks the PR till linting passes.