The repositories page
Every public repository on the account, with language, licence, size, issue count, last push and topics. Everything here comes from the public GitHub API, in your browser.
Finding one
Search covers the name, the description, the language and the topics. Sort by recency, stars, forks, name or size. Filter to source only or forks only, and filter by language. The language filter is a real link, so /repos/?lang=Go is a shareable address rather than a state you cannot return to.
Reading the numbers
Readmes
A readme is a second request per repository, so one never loads until you ask for it. Once fetched it is kept in this browser and does not cost another request.
The text is stripped of markup, images, badges and code, which is why it reads as a paragraph rather than a document. That is a filter, not a renderer: it removes things and does not try to understand what is left.
GitHub's rate limit
The API is called anonymously, which means roughly sixty requests an hour per address. That is the number that actually constrains this site, not anything in its own code.
The repository list is cached in your browser for fifteen minutes, so coming back does not spend another one; readmes are cached until you clear them. When the limit does run out, the page says which limit it hit and keeps showing the last copy it had, labelled with its age.
It does not show an empty list and call that the current state, which is the failure mode to look for if a page looks wrong.