Update README.md

[blueicehaller]

Summary

Documentation link has been changed to Getting Started and Installation
53 - [Getting Started and Installation](https://docs.hyperion-project.org/user/GettingStarted.html)

Installation link has been changed to Getting Started
67 See [Getting Started](https://docs.hyperion-project.org/user/GettingStarted.html) or on the [Release Repository](https://releases.hyperion-project.org).

Follow up of #1779

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)
• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[Lord-Grey]

@blueicehaller Thank you for the corrections.