Restructure repo

[haampie]

Rationale

With over 5k packages navigating the builtin repo is quite cumbersome, specifically through the GitHub UI:

Sorry, we had to truncate this directory to 1,000 files. 4,582 entries were omitted from the list.

Description

Some package managers choose to create subdirs for the first letter:

a/ b/ c/ ... z/

Or even

aa/ ab/ ac/ ... ba/ bb/ ... zz/

Or

a/a/ a/b/ ... z/z/

That would make browsing through github a bit easier.

[adamjstewart]

Another idea I've had would be to put language-specific packages in subdirectories, like py/, r/, etc. However, we now have ~1K R packages, so this would give us the same issue. Of course, we would also run into this issue with r/ and p/.

Current workaround is to manually type the package name in the browser URL, but I understand that this is cumbersome. Most other package managers and repos like PyPI seems to use the structure you propose.

[adamjstewart]

P.S. I wonder if this should be a Discussion instead of an Issue, although no one seems to pay attention to Discussions...

[vsoch]

We do this in autamus! https://github.com/autamus/registry/tree/main/spack