Platform change doesn't remember the URL path

[iker-barriocanal]

Steps to Reproduce

1. Go to the JS SDK custom instrumentation page.
2. Change the platform to e.g. Python.

Expected Result

Get redirected to the Python SDK custom instrumentation page.

Actual Result

Get redirected to the Python SDK getting started page.

Additional Info

Switching the platform back to JS keeps me on the getting started page.

[getsantry]

Routing to @getsentry/product-owners-docs for triage ⏲️

[Shubhdeep12]

In that case, we should store the previous visit url in session storage ideally - plaform wise.
If we found the url or page, otherwise the default page.