<issue_start><issue_comment>Title: Restructure activities/codebasestewardship
username_0: Proposes a fix for #1076 

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[View rendered activities/codebase-stewardship/index.md](https://github.com/publiccodenet/about/blob/restructure-activities/codebasestewardship/activities/codebase-stewardship/index.md)
<issue_comment>username_0: Further ideas:
- [ ] remove the success-of-a-codebase page, as we have never used this
- [ ] remove existing-projects link in first paragraph, as it comes later as resource