refactor(project): replace repo api call method with hook and swr

Instead of using post slug and an environment variable to fetch repo
data, I use the given repo in each project MDX file. It allows me to
fetch data from another user/organization if needed.
To make it work, I no longer provide the full URL in MDX file. The new
format is: "User/repo-slug".
I also replaced the fetch method with SWR to improve caching and to
avoid React complaining about cleanup useEffect.

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