… typo.

- getting_started/index: Replace with primer/index
- getting_started/use_cases: Move to guidance/design/user_needs. Add link on guidance/design.
- getting_started/contracting_process: Replace with primer/how. Update text on guidance/build. Worked example at schema/identifiers.
- getting_started/building_blocks: Remove. Repeats information on schema/reference and primer/how. (Might restore some elements.)
- getting_started/releases_and_records: Replace with primer/releases_and_records. (Might restore some elements.)
- getting_started/publication_patterns: Remove. Packaging is de-emphasized in 1.2. "Bulk and individual files" at guidance/build/hosting and primer/releases_and_records.
- getting_started/validation: Remove. Repeats information in guidance/build (validation, conformance) and guidance/publish/quality (completeness, utility). Add reason to use the Data Review tool to guidance/build.
- getting_started/quality: Move to guidance/publish/quality. Add section to guidance/publish.
- Update internal links based on above chnges
- make pdf: Add new and missing pages

…setting release.id

…e-line.