Build a 'project templates' page from scattered bits

Problem to solve

We have no centralized information about project templates. It's scattered across several pages. As part of my OKR (technical-writing#839) let's extract this information and build a single, unified page for it.

Pages with some part of the information:

• https://docs.gitlab.com/ee/administration/custom_project_templates.html (this page will be listed as my OKR)
• https://docs.gitlab.com/ee/user/group/custom_project_templates.html
• https://docs.gitlab.com/ee/user/project/pages/getting_started/pages_new_project_template.html
• https://docs.gitlab.com/ee/user/project/working_with_projects.html#create-a-project-from-a-built-in-template

Further details

Proposal

Who can address the issue

Other links/references

• Related to technical-writing#839
• On the CTRT by writer spreadsheet, this page is line 9 when sorted by score.
• 14.09.2023 sync meeting notes includes a video recording