Issue: Update Documentation for HTTP Timeouts and http_utils helper

[chauhan-varun]

We need to update a few files to reflect the new HTTP_TIMEOUT setting and the http_utils helper.

contribute.md

• In the "How to add a new analyzer" section, add a note to use api_app.http_utils for all HTTP requests. This ensures they respect the global timeout.
• Update the health_check mention to clarify it uses a default 10s timeout now.

installation.md

• Add HTTP_TIMEOUT to the optional environment variables list. The default is 90 seconds.

[mlodic]

@chauhan-varun there's too much AI in your issues/PRs. I want to work with humans. Use AI only when it's needed, how something easy and simple like this became 100 lines? That's really confusing and not helping

[chauhan-varun]

@mlodic I really apologize for the confusion. I don't use AI that much, mostly just for help writing issues or reviewing PRs. I originally only planned to fix the timeout in a few places, but after some AI feedback, I ended up migrating the whole codebase. I see now that it was too much at once I’ll definitely keep this in mind and consult you before doing any more big migrations, Really sorry about this