K8s 1.30 updates

[evilnick]

Done

Added docs pages for K8s 1.30 update

This includes:

• creating 1.30 pages (upgrading,components and release notes)
• updating the supported versions page
• updating the main release notes page
• fix for the COS tutorial
• fix for OpenStack integration

Note that the content of these pages has already been reviewed here - charmed-kubernetes/kubernetes-docs#849

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes

[webteam-app]

Demo

Jenkins

demos.haus

[immortalcodes]

I looked through the demo docs and everything seemed fine, very minor comments for code.
Would you have me pay special attention to any other aspect of this PR? If not rest seems good.
Thanks for the good work

[immortalcodes]

Markdown treats multiple blank lines as one, do you think we can use a singe line here

[immortalcodes]

same applies to all the files

[evilnick]

Thanks for the review @immortalcodes , will take a look at the spacing in the templates for the next time 👍