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

Add LICENSE

Record initial version of the Makefile