5.1.0 Release

What's Changed

• Issue #37: Added documentation for v4 and v5 by @alexmerlin in #38
• Added docs-build GA file by @alexmerlin in #40
• mkdocs.yml: Removed redirects by @alexmerlin in #42
• Replaced own CI file with Laminas's single CI file by @alexmerlin in #44
• Fixed Build static badge in README.md by @alexmerlin in #45

Full Changelog: 5.0.0...5.1.0