additional features for benchers

[kjappelbaum]

• [x] add record method toBench to record additional metadata on each fold
• [x] create a copyable template field for a BibTeX citation
• [x] the pages on the leaderboard should be versioned
• [x] capture environment info
• [x] CH4DC benchmark

[kjappelbaum]

How do we version the benchmarks? They should each have their own version

[kjappelbaum]

done