Improve multi-author support PR

[Kirsty21]

Fixes

• Fixes [Feature] Improve multi-author support: multiple gravatar images #684 by @TimidRobot
  • Always use a specific image when there are multiple authors

Description

This PR adjusts the macro of files authors_gravatar.html and posts.html so, whenever a post has multiple authors an image that is chosen to represent multiple authors instead. The gravatar for all other single author posts remains the same (according to their email addresses)

It also resolves issues with previous PR #768 that I mistakenly closed (my deepest apologies)

Technical details

• If statements that takes the length of post.author and checks whether the number of authors is above or equal to 1
• Also, in reference to your previous comment on PR Improve multi-author support with specific image for multiple authors #768 , placing this logic in the themes/vocabulary_theme/templates/macros/authors_gravatar.html is something I plan to take on as a larger project as in order to implement it, I will need to change the logic of multiple other files that are outdated and contradictory (with your permission)
• However, if not, this can be a permanent fix

Screenshots

Before:

After:

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[TimidRobot]

you're very close! just a couple of requested changes

[Kirsty21]

you're very close! just a couple of requested changes

Hi there! Thank you for helping me numerous times to fix my PR. I hope I don't cause you anymore trouble.

[TimidRobot]

good work!