purge defunct XMPP cert pin for dukgo.com, the main COMODO one covers this

It seems that the dukgo.com certificate that included this signing cert has
been replaced by one that no longer is signed by this cert.  The new one is
signed by the higher level COMODO cert that is already included:

SubjectDN: CN=COMODO RSA Certification Authority, O=COMODO CA Limited, L=Salford, ST=Greater Manchester, C=GB
IssuerDN: CN=AddTrust External CA Root, OU=AddTrust External TTP Network, O=AddTrust AB, C=SE
Fingerprint: F5AD0BCC1AD56CD150725B1C866C30AD92EF21B0
SPKI Pin: 6E584E3375BD57F6D5421B1601C2D8C0F53A9F6E
make Orbot install link a direct link to app in Google Play and F-Droid

This market: URI syntax takes the user directly to the page for the app
itself, based on package ID, rather than doing a search.  This link also
works with F-Droid.

https://developer.android.com/distribute/tools/promote/linking.html