Code cleanup

This PR is kind of big. It:

- Removes all the holdove metrics from Charlotte
- Removes a bunch of development console.log() statements
- Removes the search.js files
- Adds the Code for America-approved license
- Changes meta info to reflect our project
- Removes the HTML for the help / walk through
- Updates humans.txt

Happy to change/edit whatever needs changing/editing! Analytics changes will be coming in a separate PR.