feat: rewrite github-trending examples

[pkarw]

Right now these examples are using firecrawl which is suboptimal. Moreover the whole content of this page added to context often causes max-tokens limit exceptions.

Let's switch to GitHub API instead

[grabbou]

So, maybe:

• we remove this example? no need for extra maintenance hassle, and we need to keep them quality
• we remove firecrawl tool, if unstable?

[pkarw]

Yea, I think it's good idea to remove github_trending which I've had removed in the recent PR (about the BDD restring framework). The other one github_trending_vector works pretty much stable so I'd keep it for now

[grabbou]

Okay, so sounds like we can or perhaps should close this issue when we merge that PR!