(6.0) Update release table to 6.0.0

[r0mant]

The release download table embedded in some pages was still using rc.1 release, update it to 6.0.0.

I manually tested all the links and they seemed to work.

[klizhentas]

@r0mant please also forward-port the PR

[r0mant]

@klizhentas #5851

[webvictim]

I'm curious why we're embedding a second set of links here, shouldn't we just be directing people off to https://goteleport.com/teleport/download? I could understand it during preview to make sure people got the correct version but now it's GA, the second set of links should probably go. It's another place we'd have to keep up to date when we introduce new versions.

[r0mant]

@webvictim Since these are "guides", I think the idea is to let people do as much as possible without leaving the page and not disrupt the flow. I'm not a fan of duplicating the links myself to be honest but I'm not aware of a decent (or any really) way to just embed our downloads table in the docs, which would probably be ideal. Maybe that's something that's on the grv/next roadmap? As a next best thing I think we could add a note here something along the lines of "or go to our Downloads page to pick an appropriate version" or something, in addition to the table?

@klizhentas Curious what you think as well ^

[klizhentas]

I agree with @webvictim please point to downloads page

[r0mant]

@klizhentas Done.