Create "What is Carvel?" page

[a-mccarthy]

Based on a lot of feedback in the community, there should be a page that talks about what Carvel is, why it was created, and why users should use it.

For this issue, we need to

• Create the content for the page. See the hackmd for a draft of the content: https://hackmd.io/@B-b-yJ1nR0ysBlj8hrLlEw/rypbmEPJp
• Figure out where this page should live on the site. We should put some or all of this content on the home page, carvel.dev. Because of how the site is configured, the home page is currently the only place that talks about all the projects together.
• Make sure there are links to this page in the project docs to allow readers to be able to find this content as they discover Carvel

[a-mccarthy]

This issue is also related to #223, which has a lot of feedback on the What is Carvel content and updating the home page. To me, I think there are 2 work steams here,

1. Create and publish a what is carvel page (this issue)
2. Update the content and possibly the layout of the home page (Clear messaging on Carvel's website/homepage #223) to reflect what we have put together in the What is Carvel page.

I'd recommend focusing on getting the information together and correct, and then publish it. This can easily become a project that snowballs into something very large and long running. After we publish, we can always iterate on the content. Interested in hearing everyone's thought on this :)

I also took a very quick pass at creating a rough draft for this content. I used a basic question/answer format in the hopes that it would be easy to get information together. Once we have more content, we can work on improving the page formatting. Hackmd link: https://hackmd.io/@B-b-yJ1nR0ysBlj8hrLlEw/rypbmEPJp

[github-actions]

This issue is being marked as stale due to a long period of inactivity and will be closed in 5 days if there is no response.

[microwavables]

Reopened and adding comment so hopefully github actions doesn't close it