Linux: Remove outdated yum instructions

[hugovk]

Similar to #1317.

For example, yum has short instructions:

As does DNF:

But apt is much longer, so it's good to tidy it away when not relevant:

---

📚 Documentation preview 📚: https://cpython-devguide--1318.org.readthedocs.build/getting-started/setup-building/#install-dependencies

[encukou]

I think we should not hide Ubuntu under “apt” -- there are people who don't know their system's package manager, and they're likely to be using Ubuntu :)

[hugovk]

Sure, shall we remove yum and rename the other tabs "Fedora" and "Debian & Ubuntu"?

Or something like "Fedora (dnf)" and "Debian & Ubuntu (apt)"?

[hugovk]

And which tab should come first? Do we have an idea of which distros our readers use most?

Random website stats https://truelist.co/blog/linux-statistics/ say:

• apt: Ubuntu + Debian + CentOS = 49.9%
• DNF: CentOS + Red Hat + Fedora = 10.3%

Suggesting we should flip the order.

[encukou]

If you remove yum, there are two left: one that's very short, and one that's more widely used.
IMO, the best presentation for that is regular sections rather than tabs, with the short one first so it's obvious that another section follows.

[hugovk]

Updated!

[encukou]

Sometimes, simple is best :)

[hugovk]

Yes, reverted the original change but we nevertheless end up with better docs :)