Move gh-pages site content into docs/ for GitHub Pages serving

Fix gemspec homepage URL; release 3.2.0

Release prep: version 3.2.0

Add Crypt3 module from rubyworks/crypt3

Rename Kernel#tee to Kernel#functor

Revert Tee rename, keep Functor

Green test suite: 0 errors, 0 failures

Fix remaining test errors

Fix more test failures; remove Array#to_proc

Fix test failures: Range precedence, step, to_ranges, occurrence

Rename CGI.escape_html to CGI.escape_xhtml

Review remaining stdlib extensions; remove Digest#base64digest

Review Math methods; fix broken kldivergence

Review Pathname extensions

Clean up random.rb for Ruby 3.x compatibility