Update README.md

Author: jbryer

README.md

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 This repository contains the source for the DAACS documentation. The documentation is built using [Bookdown](https://bookdown.org/yihui/bookdown/) and is available at [docs.daacs.net](https://docs.daacs.net). The site uses the [Geekdocs](https://geekdocs.de) theme; the full documentation is available here: https://geekdocs.de/usage/getting-started/