Moved useful info from Notion into the K8s / Altinity Operator page

[DougTidwell]

I have read the CLA Document and I hereby sign the CLA

Moved data and links from Notion pages into /content/en/altinity-kb-kubernetes/_index.md. Also put its sub-page into draft mode and added an alias to the parent. Finally, took a Notion link out of content/en/engines/mergetree-table-engine-family/versioned-collapsing-mergetree.md.