✨ Add semver alias and refresh docs

[sjquant]

Why

Typing {major}.{minor}.{patch} for common custom tag prefixes is verbose, especially for monorepo release tags like mobile@26.34.0. The README also had numbered-list code fences that rendered incorrectly after item 10 because of Markdown continuation indentation, and the official docs site should be easy to find from the repo.

Changes

• Add {semver} as shorthand for {major}.{minor}.{patch} in version patterns.
• Cover matching, next-version generation, and changelog baseline discovery with tests.
• Document the shorthand across CLI help, README, GitHub Action docs, and website docs.
• Simplify the README quickstart into a short beginner flow and keep advanced examples in the command reference/docs.
• Refresh README and website command reference coverage for changelog, output formats, push, and annotated tag options.
• Link the official docs site at https://sjquant.github.io/flopha from the README and docs website source.