chore: multiple small content patching

[jack2000-dev]

v1.0.1

• de: add ETL/ELT image (DAB/de/fundamentals/)
• de: practical snippet (DAB/de/snippets/)
• fix: repo rename to TDB
• fix: URL and internal links rename to TDB
• docs: update profile README.md accordingly
• docs: update TDB README.md accordingly
• feat: add docker section (where should I put this? DE?)
• feat: add PostgreSQL section