Outdated links on Wiki front-page

[Sheogorath]

Hi all,

I just noticed that we still serve outdated links for "installation
guide" and "release notes" on the wiki front-page[1].

Since they still link to f26 which just went EOL I think it's really
time to change them.

Maybe there should be a default redirect link to something like "latest"
which can be updated automatically. So we don't need to maintain this
anymore.

[1]: https://fedoraproject.org/wiki/Fedora_Project_Wiki
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Signed
Sheogorath