Revise downloads page

[SimonGreenhill]

Some of the feedback last week was that it was hard to get the DPLACE data. We should try make this clearer. The text for the download page currently reads:

The D-PLACE data is curated in a repository on Github - https://github.com/D-PLACE/dplace-data with this web application serving the latest released version. So for access to the full data, please clone this repository or download one of the releases.

Releases are additionally archived with ZENODO, and the DOI provided by ZENODO should be used when citing particular releases of D-PLACE data.

Can we revise this to, e.g.:

<h2>Dataset Releases:</h2>

To Download the D-PLACE data please choose one of the official released versions:

* Version X, date, <link to zenodo> <doi>
* Version Y, date, <link to zenodo> <doi>
* Version Z, date, <link to zenodo> <doi>

Releases are archived with ZENODO, and the DOI provided by ZENODO should be used when citing particular releases of D-PLACE data.


<h2> Dataset Revisions and Development: </h2>

The D-PLACE data is curated in a repository on Github - https://github.com/D-PLACE/dplace-data with this web application serving the latest released version. So for access to the full data, please access this repository, and submit comments or pull requests there.

[SimonGreenhill]

@kirbykat

[chrzyki]

Any specific versions that should be linked or basically everything in https://zenodo.org/record/1466634? Also, the 1.0 version is doubled (i.e. it exists twice in separate ZENODO entries) in this separate entry, correct? https://zenodo.org/record/439199

[SimonGreenhill]

I'd say all releases would be useful. I'm not sure how the duplicate happened?