Add disclaimer with CC-BY-SA 4.0 license

[matthias-samwald]

Please add a disclaimer adding the https://creativecommons.org/licenses/by-sa/4.0/ license to the page (request from netidee). Thanks!

[nomisto]

Sure, on the web page or on the repo?

[matthias-samwald]

On the webpage. Thanks!

[matthias-samwald]

Unfortunately https://openbiolink.github.io/ITOExplorer/ does not seem to load currently (on Chrome and Edge)