How to create a GitHub Token section

Create a section in between `index generator` and `how it works` to guide users on how to create a usable github token. the difference between using a token and not is night and day. **300** unauthenticated requests vs **6000** authenticated requests. we should tell users that using a token is the best way to use the tool

Locate the website source for the “index generator” and “how it works” sections, then read how nearby page content is structured. Add an intervening section explaining how to create and use a GitHub token, including the authenticated and unauthenticated request limits. Done when the guidance is visible in the intended location and clearly recommends using a token.

Written by the indexing model from the issue text.