Basic update for new GitBook structuring standards

.gitbook.yaml

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+root: ./
+
+structure:
+  readme: index.md
+  summary: SUMMARY.md

README.md

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-# WorldWide Telescope Data Files Reference
+# WWT Data Files Reference: Source Code
 
-This document describes the data file formats used by the WorldWide Telescope. The files are XML files, and have the extension .WTML. Also covered are a few URL based controls that enable the sharing of single images without creating data files.
+This repository contains the source code for the
+[AAS WorldWide Telescope Data Files Reference] documentation. The `master`
+branch of this repo is rendered by [GitBook] to appear here:
 
-Data files are used to add to the default data and user experience of WorldWide Telescope. Data files are used to add single or multiple images -- either foreground images (typically single images referred to as _studies_) or background images (typically created from a large number of images, covering all or most of the sky, and referred to as _surveys_), to add tours (animated slide-shows), to create sign up files for communities (public or private groups that can share data), and to add simple or complex sets of data and links for those communities.
+### https://worldwidetelescope.gitbook.io/data-files-reference/
+
+If you’re just interested in the documentation itself, you should go to that
+website. If you’re interested in *contributing* to this documentation, you’ve
+come to the right place! If you’re new to the project, please see the
+[WWT Contributors’ Guide] and the [WWT Code of Conduct]. We operate with a
+standard [fork-and-pull] model.
+
+[AAS WorldWide Telescope Data Files Reference]: https://worldwidetelescope.gitbook.io/data-files-reference/
+[WWT Contributors’ Guide]: https://worldwidetelescope.github.io/contributing/
+[WWT Code of Conduct]: https://worldwidetelescope.github.io/code-of-conduct/
+[fork-and-pull]: https://help.github.com/en/articles/about-collaborative-development-models
+
+The files in this repository follow the structure described in the
+[WWT GitBook Markdown documentation specification]. The content is
+fundamentally in [Markdown] format, but there are special patterns and extra
+features used by [GitBook].
+
+[GitBook]: https://docs.gitbook.com/
+[WWT GitBook Markdown documentation specification]: https://worldwidetelescope.gitbook.io/miscellaneous/documents/gitbook-spec
+[Markdown]: https://commonmark.org/
+
+
+## Acknowledgments
+
+The AAS WorldWide Telescope system is a [.NET Foundation] project managed by
+the non-profit [American Astronomical Society] (AAS). Work on WWT has been
+supported by the AAS, the US [National Science Foundation] (grants [1550701]
+and [1642446]), the [Gordon and Betty Moore Foundation], and [Microsoft].
+
+[.NET Foundation]: https://dotnetfoundation.org/
+[American Astronomical Society]: https://aas.org/
+[National Science Foundation]: https://www.nsf.gov/
+[1550701]: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1550701
+[1642446]: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1642446
+[Gordon and Betty Moore Foundation]: https://www.moore.org/
+[Microsoft]: https://www.microsoft.com/

SUMMARY.md

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 # Summary
+
 * [Collections Files](collections.md)
-  * [Structure of a Collection File](collections.md#structure-of-a-collection-file)
-  * [Places](collections.md#places)
-  * [Studies](collections.md#studies)
-  * [Surveys](collections.md#surveys)
-  * [Tours](collections.md#tours)
-  * [Communities](collections.md#communities)
-  * [Including Other WTML Files](collections.md#including-other-wtml-files)
-  * [WTML Samples](collections.md#wtml-samples)
 * [Sharing Views](sharingviews.md)
-  * [Goto](sharingviews.md#goto)
-  * [ShowImage](sharingviews.md#show-image)
-  * [Command Line](sharingviews.md#command-line)
 * [Appendices](appendices.md)
-  * [Classifications](appendices.md#classifications)
-  * [Constellations](appendices.md#constellations)
-  * [Taxonomy](appendices.md#taxonomy)

index.md

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+---
+description: Reference documentation for various WWT data files.
+---
+
+This document describes the data file formats used by the WorldWide Telescope. The files are XML files, and have the extension .WTML. Also covered are a few URL based controls that enable the sharing of single images without creating data files.
+
+Data files are used to add to the default data and user experience of WorldWide Telescope. Data files are used to add single or multiple images -- either foreground images (typically single images referred to as _studies_) or background images (typically created from a large number of images, covering all or most of the sky, and referred to as _surveys_), to add tours (animated slide-shows), to create sign up files for communities (public or private groups that can share data), and to add simple or complex sets of data and links for those communities.