Why is the PGP key used on Navalny's website?

Question

Electronic digital signature

I noticed in the source codes of the bulk PGP site the key
https://fbk.pe/poll/js/key.js
https://poll.fbk.info/i/
I did not understand why it is used there.
Can someone explain?

Answer 1

Probably sent messages are encrypted on the client https://github.com/openpgpjs/openpgpjs

<script type="text/javascript">
      window.openpgp.config.aead_protect = false;
      window.openpgp.initWorker({
        path: 'https://poll.fbk.info/static/js/openpgp.worker.min.bb0dac1eb689.js'

      });
    </script>