* add HTML and Gemtext UI
* extend NJA3
* decode hex-encoded Client Hello message sent as query string
* decode compress_certificate extension (RFC 8879)
* update golang.org/x/crypto from v0.5.0 to v0.13.0
* in /json/v2, expose IANA "recommended" boolean field for
cipher_sutes and signature_algorithms
* suggest certbot's `--deploy-hook` option in INSTALL.md