Blog post on CentOS7 container deprecation (tag removal)

[sxa]

Related: adoptium/temurin-build#3795 and the PR at adoptium/containers#583

Decide on a Blog post title
Decide on a descriptive title for your new blog post and reference it in the title of this issue. The pull request to address this issue will have a 'Slugify-ed' version of the blog post title as the directory in https://github.com/adoptium/adoptium.net/tree/main/content/blog. See the instructions at https://github.com/adoptium/adoptium.net/tree/main/content#adding-content for details.

Determine what content theme this blog post relates to migration
As per #1956, there are several themes that a new post can relate to, and this also determines which tags to use for the post.

Gather supporting images and media
Find helpful supporting material to make your new blog post more interesting to read.

Set a target publish date ASAP
Each new blog post should have a target publish date that is represented in the Adoptium Content Streams calendar. The date can be revised as needed, this just helps the marketing committee plan better.