Cleanup Katello versions, convert remaining legacy ones to PDF, update some wording

[ianballou]

I tore out the Katello 3.17 and 3.18 docs and turned them into PDFs. I also updated a little of the Katello landing page wording to match modern Katello. Links to the nightly docs have been removed, along with the out of date nightly docs that are currently there.

I also need two PDF files (the Katello 3.17 and 3.18 docs) uploaded to downloads.theforeman.org. I can't post them here because they're too big, so let me know how I can get those files uploaded.

[jeremylenz]

@evgeni Can someone take a look at this? 👀

[ekohl]

@ianballou we don't have an easy way to do that. Can you make them available somewhere else? Then I can upload it manually.

[evgeni]

Yeah, last time we played that game James copied me the PDFs on some internal RH machine and I downloaded them from there.

[ianballou]

@ekohl and @evgeni you should both be getting emails about the PDFs for Katello 3.17 and 3.18.

[ekohl]

Reading through it it appears everything links to the website again, which will break once this is merged. I also think it's very confusing to have the navigation show up multiple times in the same document.

I wonder how you created them and if something like https://github.com/abemedia/jekyll-pdf could perhaps produce a better result.

[ianballou]

Hm yeah those links aren't great. I'll have to try generating the PDFs again. I used the instructions here, not sure why the PDFs ended up formatted weirdly. https://github.com/theforeman/theforeman.org/tree/gh-pages/plugins/katello/legacy