Date Facets from 2004, tell its origin story, and note 3.2.0's versioning

[trans]

Follow-up to #337.

2004, not 2005

work/HISTORY-0.rdoc records the rename to Ruby Facets in 0.5.0 on 2004-12-23, and the old .index metadata recorded a creation date of 2004-12-16. 1.0.0 followed on 2005-12-04, which is where 2005 came from. These now say 2004:

• LICENSE.txt: Copyright (c) 2004, Thomas Sawyer
• README.md: "Facets took its name in 2004, growing out of a small methods library started in 2002"
• Home page: "A Ruby library since 2004"
• News page: "growing since 2004"
• Contribute page: "began Facets in 2004, building on a methods library he started in 2002"

Origin story

The news page's archive section, retitled "Over twenty years of ideas.", gains a short history from work/HISTORY-0.rdoc:

Facets grew out of TomsLib, a handful of useful methods started in July 2002. It was renamed Succ (2003), A.B.C. (2004) and Raspberry (2004) before becoming Ruby Facets in December 2004, with 1.0 following a year later.

3.2.0 should have been 4.0.0 (922b856)

3.2.0 removed methods and raised the minimum Ruby to 3.1, which under semantic versioning called for a major version. Rather than yanking the 3.2 releases, which would break anyone whose lockfile pins them, HISTORY.md now says so at the top of the 3.2.0 notes:

Note: This release removed methods and raised the minimum Ruby version to 3.1, so it should have been released as 4.0.0. Treat the 3.2 series as a major upgrade from 3.1, and review the Removals below before upgrading.

The next release, which already contains breaking changes, can be 4.0.0.

Fixes from the #337 review

• docs/build.rb sets Encoding.default_external = Encoding::UTF_8, so the build no longer crashes outside a UTF-8 locale. It now builds with LANG unset.
• news.html links the 2.4 release post, which was built but not linked from anywhere.

Checks

• Rebuilt with ruby docs/build.rb. Only index.html, news.html and source.html change, and only in the edited text.
• All archive links resolve, and no "2005" remains in the README, the license or the pages.
• The archive section renders cleanly at desktop (1200px) and mobile (390px) widths, with no horizontal overflow.

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