alpgen: point url to archive.org and deprecate

[wdconinc]

This PR updates the alpgen url to point to archive.org since the homepage is dead and gone, not to be found anywhere in google. Mark only version as deprecated.

[spackbot-app]

Hi @wdconinc! I noticed that the following package(s) don't yet have maintainers:

• alpgen

Are you interested in adopting any of these package(s)? If so, simply add the following to the package class:

    maintainers("wdconinc")

If not, could you contact the developers of this package and see if they are interested? You can quickly see who has worked on a package with spack blame:

$ spack blame alpgen

Thank you for your help! Please don't add maintainers without their consent.

You don't have to be a Spack expert or package developer in order to be a "maintainer," it just gives us a list of users willing to review PRs or debug issues relating to this package. A package can have multiple maintainers; just add a list of GitHub handles of anyone who wants to volunteer.

[wdconinc]

@vvolkl Do you know if this package is still being used? Michelangelo Mangano, https://theory.cern/roster/mangano-michelangelo, is the original author (see link to the dead page at the bottom of his profile). Maybe you happen to know him? Or maybe this is somewhere on gitlab.cern.ch (but I cannot search site-wide without a cern account).

[vvolkl]

@vvolkl Do you know if this package is still being used? Michelangelo Mangano, https://theory.cern/roster/mangano-michelangelo, is the original author (see link to the dead page at the bottom of his profile). Maybe you happen to know him? Or maybe this is somewhere on gitlab.cern.ch (but I cannot search site-wide without a cern account).

I've sent off an email to point out this problem. I'm not aware of any users though.

[vvolkl]

@wdconinc the url is now https://alpgen.web.cern.ch/ . I'll update the recipe in another PR