css: move overflow wrap rule to markdown.css

[julien-deramond]

⚠️ This PR is a draft

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Description

This PR is a follow-up of what's been discussed in #1736 (review)

I do wonder if our generic set-up for this in reset.css ought really also to be moved to markdown.css:
[...]
In a quick check, I think the only element this currently applies to which is outside of the Markdown content is the page title.
But that can happen as follow-up work to keep this PR focused on the specific fix.

Basically, we move the p ,h1, h2, h3, h4, h5, h6, code { overflow-wrap: anywhere; } rule to the markdown.css.

Temporarily, the red code shows the elements impacted by the previous rule, and the green one shows the elements impacted by the new rule.

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[julien-deramond]

I've been through the entire doc, the only elements that are displayed in red (old rule) are the page main titles, and the "On this page" area (see https://starlight-git-fork-julien-deramond-main-jd-dc421d-astrodotbuild.vercel.app/getting-started/).

The search message error is probably not important, and the main title as well:

The rest in green works well.

One solution would probably be to keep that in markdown.css and add specific rules for this main title and "On this page" area. What do you think @delucis? Want me to try this approach in this PR?