fix a load of spacing issues in frontend content

[chris48s]

I'm not going to claim I have caught every single documentation string with a spacing issue, but I reckon I've got >90% of them. This also lays down a pattern for fixing them if we find any more I have missed.

I have mostly chosen to fix these by converting them to markdown (which we can now use instead of HTML, if we want). In one or two cases, I have moved ht HTML around a bit. In general, we might want to consider converting all of these to markdown, but that is a bigger job.

I won't go through every single page with a spacing issue, but here's a few before/after links

before	after
https://shields.io/badges/git-hub-contributors-via-allcontributors-org	https://pr-9281-badges-shields.fly.dev/badges/git-hub-contributors-via-allcontributors-org
https://shields.io/badges/you-tube-channel-views	https://pr-9281-badges-shields.fly.dev/badges/you-tube-channel-views
https://shields.io/badges/ping-pong-status	https://pr-9281-badges-shields.fly.dev/badges/ping-pong-status
https://shields.io/badges/git-lab-all-merge-requests	https://pr-9281-badges-shields.fly.dev/badges/git-lab-all-merge-requests

Refs #9280

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	Messages
📖	✨ Thanks for your contribution to Shields, @chris48s!

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[chris48s]

I'm going to go ahead and just merge this one