Merge pull request #63 from teesofttech/docs/43-github-pages-site

docs: add GitHub Pages documentation landing page

Merge pull request #42 from teesofttech/feature/5-termii-provider

Implement Termii provider

SmsBridge v0.3.0

Merge pull request #30 from teesofttech/feat/issue-9-telnyx-provider

feat: implement Telnyx SMS provider

ci: drive NuGet package version from GitHub release tag

Extracts the semver from the git tag (strips the v prefix) and passes
it to dotnet pack via -p:Version, so no manual .csproj edit is needed
on each release. Placeholder version 0.0.0 is set in the project file.