[DOCS] Missing multiple features

[iocron]

As of today (2024-01-16) the frontpage https://gitness.com/ is mentioning a couple of features. Sadly, those features are nowhere to be found / documented:

• Integrations (such as AWS, Github, ..)
• Gitness can automatically migrate code repositories and pipelines from GitHub, GitLab, Bitbucket, Circle
• Horizontal Scaling of Gitness Runners (not related to the frontpage)
• Gitness CLI Docs
• and there is no Search Bar!