Install instructions not easily readable online

[rlskoeser]

The installing.html file referenced in the README provides useful installation instructions, but is not easily readable on GitHub. I recommend including it in the GitHub pages site and then linking directly to the current version from the readme. (Alternatively, you could convert the installation instructions to markdown for easy display on GitHub directly.)

Might be nice to link to exist documentation on the package manager, for anyone who needs more info/help on installing package dependencies.

Also consider adding a link to the github pages site more generally.

[rlskoeser]

Related: installation instructions indicate that the xml data repos include instructions for loading data, but they do not. See Princeton-CDH/bluemountain-transcriptions#19

It looks like there is some documentation of this in the bluemountainsprings readme - probably better to document more thoroughly on the actual data repo and reference the documentation in the readme or (better) installation instructions.

Possibly also relevant (i.e., needs documentation for loading data) on the other data repo? https://github.com/pulibrary/BlueMountain