* Fix misc stuff from lighthouse
- Icons in list were resizing to be too small.
- Added robots.txt (full exclude for now)
- Add favicon.ico placeholder
- Added page title using helmet (react-helmet + gatsby-plugin-react-helmet)
Note: not sure if react-helmet can be in dev section of package.json?
* Move helmet to header file
- Moved `<Helmet><title>{title}</title></Helmet>` to Header.
- Added ts support for Helmet.
* Fix title header
