Docs: Update gardenlinux commit

[ByteOtter]

What this PR does / why we need it:

Update the gardenlinux commit to latest, so that post install steps are properly linked in the install guides.

gardenlinux/gardenlinux@b306ec1

Which issue(s) this PR fixes:
Fixes: n/A

Definition of Done:

• The code is sufficiently documented
• Shared the changes with the Team so everyone is aware
• The code is appropriately tested
• Checked if the code needs to be backportet to release branches of maintained versions (perform the actual backport after the merge to main)

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[yeoldegrove]

Please fix the Titles and descriptions of the pages to something similar than in the tutorials section (unified approach).

Browser metadata

Path:      /tutorials/
Browser:   Firefox 150.0 on Linux x86_64
Viewport:  2216 x 1153 @1x
Language:  en-US
Cookies:   Enabled

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[ByteOtter]

Please fix the Titles and descriptions of the pages to something similar than in the tutorials section (unified approach).
Browser metadata

Open Deploy Preview · Mark as Resolved

Done. Changed the title of these guides to fit the tutorials section. The inner title can be adjusted once they are filled with content.