Improve full view functionality in ReadmeCard

[fridajac]

Hey, I just made a Pull Request!

Changes:

• Replaced the full screen icon with the more appropriate MUI FullscreenIcon. This to better indicate that a new full view dialog has been opened.
• Added functionality for maintaining the full view state in the URL, making it possible for user to link directly to the full view.

Context

In our Axis Backstage application, we use different full screen icons in different components. We should be consistent and always use the MUI FullscreenIcon.

In addition, only handling the full view of the ReadmeCard through an useState-hook won't make it possible for user to link directly to the full view. Handling it in the URL is a more commonly used approach.

Screenshots

Checklist before requesting a review

• I have performed a self-review of my own code
• I have verified that the code builds perfectly fine on my local system
• I have verified that my code follows the style already available in the repository
• A changeset describing the change and affected packages. (more info)
• Added or updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)

[changeset-bot]

🦋 Changeset detected

Latest commit: 32b5121

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@axis-backstage/plugin-readme	Minor
app	Patch
backend	Patch

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