Doc

added 80 commits

• faca72cd...360d4f2b - 47 commits from branch main
• 360d4f2b...47cf1fa5 - 23 earlier commits
• 5f90922c - docs: rewrite some parts
• 250f504b - docs: new buffer mechanism
• bf2e6ae7 - docs: formating
• 5db1442e - docs: add img
• 443dbe85 - docs: update vm
• 8edc94c7 - docs
• 9977cdd7 - docs: add a bug fix
• d16953c4 - docs: add flush tlb bug
• 74235b95 - docs: EI-related problem
• 066494c4 - docs: lock

Compare with previous version

merged

mentioned in commit c54210d3