feat: Ignore certain repos

[Kaamkiya]

I would like to be able to ignore certain repositories.

For example, my dotfiles have around 400 lines of Vim Script, which makes this action show 26% Vim Script on my profile, even though I don't actually use it much.

Implementation
This could probably be solved quite easily, with an environment variable EXCLUDE_REPOS containing comma-separated repo names, and then filtering the GraphQL result to exclude those repos.

Thank you!

[teoxoy]

Hi, a PR for this would be welcome.