migrate the wiki guide links to the community repo & small changes

[KobeW50]

and ofc remember to update the "Last updated by Spacellary on..." if u merge this

https://github.com/ReVanced-Extended-Community/Community-Guides/blob/12c32f8d2559792edeac8e8e875d29ba1846d49a/youtube/guide-for-beginners.md?plain=1#L18C1-L18C58