Add a top-to-bottom button

[karishmaaa101]

Is your feature request related to a problem? Please describe.
I often find it difficult to navigate the documentation on the Firebase website, especially when trying to jump between sections quickly. There doesn't seem to be an easy way to go directly from one part of the page to another, such as from the introduction to the detailed guides or API reference

Describe the solution you'd like
I would like to see a "Top-to-Bottom" button added to the documentation pages. This button would allow users to quickly navigate from the top of the page to the bottom (or vice versa), making it easier to access different sections without manually scrolling.

Describe alternatives you've considered
I've considered using browser extensions to auto-scroll or smooth-scroll, but it's not as seamless as having the feature built directly into the website. Additionally, a quick jump feature (such as an anchor or table of contents) would be more user-friendly.

Additional context
This feature would enhance the overall user experience, especially for those who are frequently switching between sections like guides and API references. It would reduce the frustration of endless scrolling and make the documentation feel more intuitive.