Update Slug for Alumni Board members

Description

Partner noticed the slug for the Alumni shows https://opensource.org/blog/status/alumni and would like to update to https://opensource.org/about/board-of-directors/alumni or https://opensource.org/about/alumni.

The changes should be made on the staging site for partners review before merging to production.

https://opensource.org/about/alumni

We can use the /about/alumni URL path to add the Alumni Board members and create a link on the About page as well

Once that is done, we can create a redirect from https://opensource.org/blog/status/alumni to https://opensource.org/about/alumni.

Note: The partner also noticed https://opensource.org/status/alumni was gone and instead it found it at https://opensource.org/blog/status/alumni and wants to know why that happened.

In addition:

CPTs and their taxonomies should not use /blog slugs in their URLs. Here’s a list of all CPTs which highlights where the issue is:

• Board Member CPT:
  (Correct) Board members: https://opensource.org/board-member/chris-aniszczyk
  Status: https://opensource.org/blog/status/alumni
  Seat type: https://opensource.org/blog/seat-type/affiliate
• License CPT:
  (Correct) License: https://opensource.org/license/blue-oak-model-license
  License Steward: https://opensource.org/blog/steward/apache-software-foundation
  Category: https://opensource.org/blog/license-category/international
• Press Mentions CPT:
  (Correct) Press mentions: https://opensource.org/press-mentions/meta-is-accused-of-bullying-the-open-source-community
  Publications: https://opensource.org/blog/publication/adda-24-7

The /blog slug should only apply to blog post types.

A few related PRs:

• Blog post migration: https://github.com/OpenSourceOrg/dotOrg/pull/56
• “removing blog path from author page: https://github.com/OpenSourceOrg/dotOrg/pull/58
• Omitting /blog/ from CPTs: https://github.com/OpenSourceOrg/dotOrg/pull/59
  Related: https://github.com/OpenSourceOrg/dotOrg/pull/61

Review related PRs 56, 58, 59, and 61 first, then inspect the Board Member, License, and Press Mentions CPT URL behavior. Validate the changes on the staging site: alumni should have an /about/alumni page and redirect, while CPT and taxonomy URLs should not use /blog. Confirm the partner-facing URLs before production merge.