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 (https://gitlab.com/gitlab-org/technical-writing/-/issues/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 <!-- * Any concepts, procedures, reference info we could add to make it easier to successfully use GitLab? * Include use cases, benefits, and/or goals for this work. * If adding content: What audience is it intended for? (What roles and scenarios?) For ideas, see personas at https://about.gitlab.com/handbook/product/personas/ or the persona labels at https://gitlab.com/groups/gitlab-org/-/labels?subscribed=&search=persona%3A --> ### Proposal <!-- Further specifics for how can we solve the problem. --> ### Who can address the issue <!-- What if any special expertise is required to resolve this issue? --> ### Other links/references - Related to https://gitlab.com/gitlab-org/technical-writing/-/issues/839+ - On the [CTRT by writer](https://docs.google.com/spreadsheets/d/1JlARS_KuKPjelPKw6F7uW9vlwt9JQbrtKnz_PYfs2Lg/edit#gid=0) spreadsheet, this page is line 9 when sorted by score. - [14.09.2023 sync meeting notes](https://docs.google.com/document/d/1TeOiCybU9QScEL4V8HdRJZXqPLrN_Va7T1GmwfEt8x0/edit) includes a video recording
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