[Advanced Installation] Replaces broken link supposed to lead to main installation guide. (Ref. #26)

[sreeharip-s]

Fixes issue #26

Due to @realyukii's initial message containing two issues, this is only issue 1 out of 2. This message will later be edited to reference the second issue too

I can't create new issue so I will comment here, the link mentioned in this page isn't working (404):

This is only for advanced users. For regular users, please visit our main Installation Guide found here.

and the section "Documentation issue" from template issue on this github repo point to the archived version

Originally posted by @realyukii in #15 (comment)