Remove duplicate #id in the index and improve visualization

[carlavilla]

Summary

Remove duplicate #id in the index and improve the visualization.

With that change, we improve two things.

First: we make the website compatible with the HTML standart eliminating two id's with the same name.
Second: Eliminating the overlap in the search box under the donate button.

Test Plan

Compile the website.

I tested with this configurations:

FreeBSD: Firefox, Chromium, Konqueror and Falkon
Arch Linux: Firefox, Chromium, Brave, Konqueror and Opera
Windows 7: IE11, Firefox, Chromium, Brave and Opera (Thanks to Virtualbox)
Windows 10: Edge, Firefox, Chromium, Brave and Opera (Thanks to Virtualbox)
MacOS: Safari

[bcr]

Oh wow, thanks for the extensive testing. Change approved!