fix: update GitHub card paths lookup

[skryukov]

This PR fixes some problems with GitHub preview card:

• it fixes a problem with parsing of repos with . in name
• it also adds a fallback for (hopefully) all reserved paths from the github-reserved-names package. It also adds a whitelist for all supported reserved paths (only /sponsors/{username} at the moment)

Thread with some broken links:
https://elk.zone/universeodon.com/@elkdev/109790632883374579

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[patak-dev]

Awesome! I wonder if at some point we could avoid the new package by using some pattern in the description to know if it is a repository, issue, or PR. But given that we load this lazily, I think this is the safest way right now. Thanks for taking care of this 🙏🏼