feat (docs): Helicone observability

[colegottdank]

No description provided.

[lgrammel]

• Please refer to the AI SDK as AI SDK (not Vercel AI)
• Please follow the structure of other observability providers, in particular start with a Setup section and try to align section names
• Please reduce marketing language to a reasonable degree - this is documentation. E.g. Setting up Helicone takes just three simple steps: -> You can set up Helicone as follows or Setting up Helicone:

[colegottdank]

• Please refer to the AI SDK as AI SDK (not Vercel AI)
• Please follow the structure of other observability providers, in particular start with a Setup section and try to align section names
• Please reduce marketing language to a reasonable degree - this is documentation. E.g. Setting up Helicone takes just three simple steps: -> You can set up Helicone as follows or Setting up Helicone:

I pushed out fixes, please let me know.
Regarding the headers, I adjusted the Setup section and attempted to align the other section names, however I noticed they were quite different between providers, so I went with best effort.

[lgrammel]

Please run pnpm prettier-fix