Add edit page button and link to GitHub in docs

[tovrstra]

One of the minor items in #204.

Based on:

• https://pradyunsg.me/furo/customisation/top-of-page-buttons/
• https://pradyunsg.me/furo/customisation/footer/

I will YOLO-merge this on Friday, June 21, unless reviewed earlier

Summary by Sourcery

This pull request updates the documentation configuration to include a button for editing pages and a link to the GitHub repository, enhancing the user experience by providing easy access to the source code and the ability to contribute.

• Documentation:
  • Added a button to edit pages and a link to the GitHub repository in the documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request enhances the documentation by adding an 'Edit on GitHub' button and a GitHub link in the footer. The changes are implemented by modifying the 'docs/conf.py' file to include the necessary configurations and an embedded SVG for the GitHub icon.

File-Level Changes

Files	Changes
docs/conf.py	Enhanced the documentation configuration to include an 'Edit on GitHub' button and a GitHub link in the footer using the Furo theme options.

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[deepsource-io]

Here's the code health analysis summary for commits d4bb73f..8eb9b17. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Shell	✅ Success		View Check ↗
Python	✅ Success		View Check ↗

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[sourcery-ai]

Hey @tovrstra - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 2 issues found
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[tovrstra]

Tests fail due to #340

[PaulWAyers]

Thanks Toon.

[tovrstra]

Just to play safe, I'll merge main into this PR and rerun tests (with the NumPy 2 fix).

[tovrstra]

Thanks for reviewing. merging...