docs: continue going through Ch 8

docs: start Chapter 8

docs: finish Ch 7: theory and exercises

docs: expand MyST Markdown sandbox page

docs: continue studying Ch 7 theory

docs: further advance Ch 7 content

docs: advance Ch 7 content

docs: polish navigation by linking to SQL benchmarking section

docs(infra): add SQL benchmarking guide and update environment setup notes

docs: complete GitVerse vs GitHub topic conclusion, and refine intro files

docs: finish Ch 6: theory and exercises

docs: finish Ch 5: theory and exercises

chore: force rebuild book to fix Ch 5 deploy issue

docs: complete Ch 5 theory without exercises

docs: polish project content and structure

chore: update environment.yml dependencies and clean channels

fix: skip stuck deploy

docs: pre-release version of 'GitVerse vs GitHub' topic

docs: finish Ch 4: theory and exercises

chore: sync myst.yml and toc.yml with new structure

chore(layout): re-engineer directory tree, cluster chapters with data assets, and standardize intro filenames

chore(layout): relocate sandbox and about to appx, and move index.md to draft

docs: complete Ch 4 theory, pending exercises