Deprecating v1.3 from docs site

[matthewshaver]

What are you changing in this pull request and why?

Removes v1.3 from the dropdown Removes all lastversion="1.3" data Removes version blocks from firstversion="1.3" data Alter some sentences that refer to v1.3

Checklist

• [ ] Review the Content style guide so my content adheres to these guidelines.
• [ ] For docs versioning, review how to version a whole page and version a block of content.
• [ ] Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding or removing pages (delete if not applicable):

• [ ] Add/remove page in website/sidebars.js
• [ ] Provide a unique filename for new pages
• [ ] Add an entry for deleted pages in website/vercel.json
• [ ] Run link testing locally with npm run build to update the links that point to deleted pages

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