### Summary I want to add a scroll-to-top button to the website. One that appears when you scroll down slightly and can take you back to the top of the website on clicking. ### Motivation When the number of algorithms increases, scroll back to the top after having scrolled to the bottom can be tedious. A scroll-to-top button can help ### Detailed Description I scroll-to-top button is simple but effective. I have clearly described what I plan to implement. ### Screenshots/Mockups (if applicable)  ### Additional Context _No response_ ### Existing Issues - [X] I have checked existing issues (open and closed) for duplicates ### Alternatives Considered _No response_