Community Programs Efficiency Project | Add OSS and Startups Verification HB page and Links on Main Page

Why is this change being made?

This MR adds a handbook page with details on the automated verification process for the GitLab for Open Source Program and adds a page with information on the Startups program verification (which will remain as is). This MR also adds links to these new handbook pages to the main automated program workflow page.

We are currently staging the pages for the automated process while we transition over.

New pages added with this MR:

• OSS Program Verification: https://about.gitlab.com/handbook/marketing/community-relations/community-operations/community-program-applications/automated-community-programs/oss-program-verification/
• Startups Program Verification: https://about.gitlab.com/handbook/marketing/community-relations/community-operations/community-program-applications/automated-community-programs/startups-program-verification/

Context:

• This workstream issue stores a high-level overview of the Community Efficiency Project
• Interim launch plan

This MR is based on the EDU version: !80508 (merged)

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the "Maintained by" section in on the page being edited.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files. (this requirement has been removed pending identification of a new DRI for the handbook)