This one might be impossible to change due to how the nexuses (nexi?) are set up, but I might as well try. The Nexus icon that leads to the main page does so indirectly through a script, and hence doesn’t register as a link in the browser. For instance, right-clicking the icon only shows options for interacting with the icon as an image rather than a link:
This has several limitations: one can’t open the main page in a new tab, copy the link to share it, etc. Ctrl+click and other shortcuts don’t work either.