T7556: Update git workflows

• Mention the initial co0 suffix
• Add DEP-14 diagrams where relevant
• Mention that component is now set as part of import-debian-package
• Remove mentions of old packaging tools

added 1 commit

• 7d5fcd32 - Update the versioning document to mention co0

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added 4 commits

• 52ce522c - Add a DEP-14 diagram
• f72c2279 - Drop a no longer relevant sentence on gitlab-ci.yml
• 0b116b34 - Update Git-related documents according to the current practice
• 5effad4e - Update the versioning document to mention co0

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added 37 commits

• 5effad4e...3bc24cef - 33 commits from branch master
• 0d3af4c4 - Add a DEP-14 diagram
• 04b9a754 - Drop a no longer relevant sentence on gitlab-ci.yml
• eb99dc95 - Update Git-related documents according to the current practice
• 150b7677 - Update the versioning document to mention co0

Compare with previous version

added 10 commits

• f26f6b32 - 1 commit from branch master
• 14e7bf49 - Add a DEP-14 diagram
• 17a99324 - Drop a no longer relevant sentence on gitlab-ci.yml
• e7d1f851 - Update Git-related documents according to the current practice
• ced86688 - Update the versioning document to mention co0
• ddc42a51 - apertis_packaging_guide: Fix syntax error
• a4d5466d - apertis_packaging_guide: Reflect usage of the external CI config
• 16eea81a - apertis_packaging_guide: Stop mentioning the -gitlab-update-job branches
• 709f7e2b - apertis_packaging_guide: Mention the child pipeline for custom jobs
• ff059c78 - gitlab-based_packaging_workflow: Link to apertis_packaging_guide

Compare with previous version

@martyn I've updated apertis_packaging_guide.md as well and fixed some broken links by linking to it.

apertis_packaging_guide.md and apertis_packaging_guide.md should probably be merged, but I didn't want to go that far tonight. :)

resolved all threads

merged