- add `npm start` script to run appium server
- add `npm run doctor` convenience script to run doctor
- renamed `clean` script to `reinstall`
- added new `clean` script to just clean
- updated the "appium from source" doc
- all tests changed were needed because of path issues. I was unable to get the tests working in their entirety _without_ adding `@appium/fake-driver` to the monorepo--it would have required a separate `npm install` step in `appium-fake-driver` due to the lack of its `devDependencies` and `prepare` script--so I figured I might as well pull it in now.
- deduped `package.json` scripts somewhat
- updated ESLint configuration to include `@appium/fake-driver`'s rule override
- sorted the root `package.json` because fussy
- added `wd` as a dev dep because `@appium/fake-driver` needs it