chore: repoint URLs at git.swaits.com and bump for release

Rewrites remaining github.com / git.sr.ht references to git.swaits.com,
translating GitHub URL shapes to Gitea's (/blob/<ref>/ -> /src/branch/<ref>/,
/tree/<tag> -> /src/tag/<tag>, /actions/workflows/X -> /actions?workflow=X,
/edit/ -> /_edit/).

Left pointing at GitHub on purpose: pull-request links (PRs were not migrated)
and GitHub-only surfaces Gitea lacks (security advisories, discussions).

Cargo.toml

@@ -3,9 +3,9 @@ resolver = "2"
 members = ["hsmc", "hsmc-macros", "verification"]
 
 [workspace.package]
-version = "0.6.0"
+version = "0.6.1"
 edition = "2021"
 license = "MIT"
 authors = ["Stephen Waits <steve@waits.net>"]
 repository = "https://git.swaits.com/swaits/hsmc"
-homepage = "https://github.com/swaits/hsmc"
+homepage = "https://git.swaits.com/swaits/hsmc"