Added JekyllPad docs in CMS section

[armannaj]

Description (required)

Expands the CMS options for Astro users with JekyllPad, a browser-based, GitHub-backed headless CMS.

Related issues & labels (optional)

• What does this PR change? Adds a stub for JekyllPad

Adds a new CMS guide:

• File: src/content/docs/en/guides/cms/jekyllpad.mdx
• Overview + features + official resources
• Consistent frontmatter (service, i18nReady, sidebar label)

Checklist

• Links verified
• Frontmatter matches other CMS guides
• Page builds and renders in sidebar

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[astrobot-houston]

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Tracked Files

File	Note
en/guides/cms/jekyllpad.mdx	Localization added, will be marked as complete.

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.

[astrobot-houston]

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[sarah11918]

Hi! If you'd like to add a new guide, please follow the process outlined in our contributing docs and note the example to follow as a model.