[simonostendorf]

Summary

• Concept doc for the site's content: projects, skills, contact form, uses page.
• Settles build time versus runtime for the cv and GitHub data, and recommends build time.
• States the boundary against simon-ostendorf.de and ostendorf.tech.
• Leaves five open questions for the implementing milestones.

Test plan

• markdownlint-cli2 "docs/concepts/ostendorf-dev.md" passes locally.
• CI checks green.

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