sidebar: Add AltArch SIG

[metalefty]

While here, sort SIGs and add Media and Entertainment SIG on the SIG landing page.

This is expected to be merged after #738.

[metalefty]

...and #751.

[bennyvasquez]

Thanks @metalefty !

[bennyvasquez]

It looks like prettier is failing due to a merge conflict? I'll take a look shortly.

/usr/bin/git cherry-pick --no-commit b04872a83918b3d98a0dcf243214b32230396ea4
Auto-merging docs/documentation/nvidia.md
CONFLICT (content): Merge conflict in docs/documentation/nvidia.md
error: could not apply b04872a... autofix
hint: after resolving the conflicts, mark the corrected paths
hint: with 'git add ' or 'git rm '
hint: Disable this message with "git config set advice.mergeConflict false"
Error: The process '/usr/bin/git' failed with exit code 1

[bennyvasquez]

It's not even letting me checkout this PR?

elita:wiki benny$ git status
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean
elita:wiki bennyvasquez$ gh pr checkout 752
From github.com:AlmaLinux/wiki
 ! [rejected]          refs/pull/752/head -> sigs  (non-fast-forward)
failed to run git: exit status 1
elita:wiki benny$

[metalefty]

@bennyvasquez Fixed.

[metalefty]

@bennyvasquez Merge #751 ASAP! As I commented, This is expected to be merged after #738 and #751. Otherwise, the link to M&E SIG is dead.

[metalefty]

Otherwise, I'll submit another PR to revert the link.