docs: trim outdated expansion notes from general guide

docs: make core prompt list the full general guide

docs: group docker and kubernetes in guide order

docs: reorder guide matrix by heat and relevance

docs: move original prompt list into archive

docs: compact readme overview section

docs: reorganize readme information flow

docs: add readme guide matrix

docs: rewrite readme as an engineering homepage

docs: add sql and nosql specialized guides

docs: add docker cicd and iac specialized guides

docs: add github community templates and support docs

docs: add open source community and security files

docs: improve readme presentation and repo metadata plan

feat: initialize ai coding prompts template repository