Fixed #37251 -- Added djlink extlinks to fix nested version markup in docs.

[vainl]

Trac ticket number

ticket-37251

Branch description

Introduced a new djlink shortcut in docs/conf.py with the caption set to None, and updated the production server reference URL in docs/intro/tutorial01.txt and docs/ref/django-admin.txt to use this new one.

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Checklist

• This PR follows the contribution guidelines.
• This PR does not disclose a security vulnerability (see vulnerability reporting).
• This PR targets the main branch.
• The commit message is written in past tense, mentions the ticket number (if applicable), and ends with a period (see guidelines).
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• I have checked the "Has patch" ticket flag in the Trac system.
• I have added or updated relevant tests.
• I have added or updated relevant docs, including release notes if applicable.
• I have attached screenshots in both light and dark modes for any UI changes.

[github-actions]

Thank you for your contribution to Django! This pull request has one or more items that need attention before it can be accepted for review.

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[github-actions]

Hello! Thank you for your contribution 💪

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