Document basic usage in the README
Change keyword property from "tags" to "keywords"
Order TOC by date, make keywords #-linkable.
Introduce tarball goal, add a way to attach customisations
Preserve directory structure in output, generate .gitignore
Separate creation of BUILD_DIR and populating it with files
Document UPLOAD_TARGET, clean up .PHONY
Fix keyword index links
Rename goal 'site' to 'web', update README.
Move goals around to make 'site' the first one
Fix typo in README
Record initial version of the Makefile