Singularize certificate logo and story

[zackkrida]

Fixes

Fixes #786 by @zackkrida

Description

cetificates to certficate

Technical details

Keeps the existing certificates.svg file so no links break out in the wild.

Tests

Screenshots

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 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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