Migrate to quarto

[maximlt]

• Migrated all blog posts
• Workflow to build and publish to holoviz-dev/blog-dev on every PR push
• Set up and test redirects from the old site
• Update workflow to build and publish to the gh-pages branch when merging a PR
• No longer host the website on AWS, just move to Github Pages
• Customize styling so it looks not too far from the other HoloViz sites
• Add link to holoviz.org
• Update README.md and document how to contribute

The migration went well, there are a few plots that aren't rendered in old blogs (I'm thinking about a blog with some Plotly plots), I thought it'd be way worse. I'm okay with some churn for old blog posts.

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[maximlt]

I've made a few more updates:

• the navbar has been updated to look similar in style to Panel's navbar and in content to holoviz.org's navbar (this site needs to be updated), the idea being that holoviz.org would have a Blog item in its nav bar and users would still feel they're sort of on the same site.
• I've changed the grid layout for the default listing vertical layout, I think I prefer that