Add code to automatically compile dataset metadata into summary table

[nbokulich]

It would be great if we could automatically compile all dataset metadata tables into one summary table that appears on the repo homepage. This could be a nice way to navigate based on basic specs, rather than requiring users to click through each directory to find the MCs that fit their interests.

Making the table searchable would be ideal.

The table could contain hyperlinks to either redirect to the entry for that mock community on the repo, or else to download raw data and other files directly from the table directly...

Is there any way to have the code run automatically every time a new mock community is submitted?

[nbokulich]

Note: the summary table currently exists, but is not yet automatically compiled each time a new dataset is submitted.

Additional feature: add presence of database identifiers to inventory? (e.g., so users interested in ref seqs rather than expected taxonomy can choose on that basis)