Base: Organize welcome.html

Previously, it was a big list of test pages in no particular order, and
it was hard to find anything. This commit breaks it up into sections,
and renames some of the links to be more consistent.

The categories are slightly arbitrary, and I'm sure everyone will have a
different opinion on what they should be, and which links should go
where. But hopefully we can all agree that this is an improvement!

This also wraps the list into multiple columns on browsers that support
it, which unfortunately does NOT include Browser. :^( But hey, once we
do it'll be good!

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