Fix docs social image URLs to be absolute ones
Prerequisites
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I have searched for duplicate or closed issues -
I have validated any HTML to avoid common problems -
I have read the contributing guidelines
Describe the issue
Broken after #36804
Reduced test cases
<meta name="twitter:image" content="/docs/5.3/assets/brand/bootstrap-social.png">
We need to conditionally construct the image URL and then pass it through Hugo's absURL
function like before
What operating system(s) are you seeing the problem on?
Windows
What browser(s) are you seeing the problem on?
No response
What version of Bootstrap are you using?
unrelated