Static link to Dfam classes

[dgruano]

Hi there!

Thank you for putting together Dfam!

The only way I found to download a file containing the Dfam classification system is by navigating to https://dfam.org/classification/tree and clicking on the tsv file icon. I believe it would be very useful to have a static link to this file (instead of it being created on the go by Angular). This would allow programatic access to the full classification system without the need to make API calls and constructing the tsv from the API response.

Would you consider adding it to the download directory of the release?