removing/updating some links

[sarah11918]

Description (required)

In preparation for removing /guides/content.mdx, just removing or updating some links to that page.

Note:

• I have not removed the page in this PR. That would break links in other languages.
• I will remove the page (with a redirect) in a PR to the 5.0 beta docs.

Related issues & labels (optional)

• Closes #
• Suggested label:

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Tracked Files

Locale	File	Note
en	guides/cms.mdx	Source changed, localizations will be marked as outdated.
en	guides/migrate-to-astro/from-eleventy.mdx	Source changed, localizations will be marked as outdated.
en	guides/migrate-to-astro/from-gridsome.mdx	Source changed, localizations will be marked as outdated.
en	guides/migrate-to-astro/from-hugo.mdx	Source changed, localizations will be marked as outdated.
en	guides/migrate-to-astro/from-jekyll.mdx	Source changed, localizations will be marked as outdated.
en	guides/migrate-to-astro/from-pelican.mdx	Source changed, localizations will be marked as outdated.
en	guides/migrate-to-astro/from-sveltekit.mdx	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[at-the-vr]

LGTM 👍