Added open-external-links.js to open external links in new tab

[rahulmansharamani14]

Summary

This PR ensures that all external links in the Mattermost documentation open in a new tab or window, addressing Issue #7048.

Changes Made

• Added open-external-links.js:

  • Located in the _static/js directory.
  • Contains JavaScript code that adds target="_blank" to all external links.

• Updated conf.py:

  • Added open-external-links.js in the html_js_files list to include this file in the build process.

Implementation Details

• The script selects all <a> elements and checks if they have the external class.
• External links are modified to include target="_blank", opening them in a new tab/window.

Testing

• Built the documentation locally using make clean build.
• Verified that:
  • External links open in a new tab/window.
  • Internal links open in the same tab/window.
• Tested across multiple pages.

Notes

• This solution depends on external links being assigned the external class by Sphinx during the build process.
• No additional dependencies are introduced.
• No changes to existing content or functionality other than modifying external link behavior.

Thank you for reviewing my PR. I'm open to any feedback or suggestions.

Ticket Link

Fixes #7048

[mattermost-build]

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[github-actions]

Newest code from rahulmansharamani14 has been published to preview environment for Git SHA 985b96e

[cwarnermm]

@rahulmansharamani14 - It looks like all links are opening in new browser windows right now, rather than only external links.