OpenKeychain: use upstream's descriptive texts

upstream uses fastlane or triple-t and their texts is a maintained version
of what is in fdroiddata:
https://fdroid.gitlab.io/fdroid-website/docs/All_About_Descriptions_Graphics_and_Screenshots

metadata/org.sufficientlysecure.keychain.txt

@@ -7,39 +7,6 @@ Changelog:https://github.com/open-keychain/open-keychain/blob/HEAD/OpenKeychain/
 Donate:https://www.openkeychain.org/
 
 Auto Name:OpenKeychain
-Summary:Encrypt files and communications with OpenPGP
-Description:
-OpenKeychain helps you communicate more privately and securely. It uses
-high-quality modern encryption to ensure that your messages can be read only by
-the people you send them to, others can send you messages that only you can
-read, and these messages can be digitally signed so the people getting them are
-sure who sent them. OpenKeychain is based on the well established OpenPGP
-standard making encryption compatible across your devices and operating systems.
-
-Modern encryption is based on digital "keys". OpenKeychain stores and manages
-your keys, and those of the people you communicate with, on your Android. It
-also helps you find others' keys online, and interchange keys by touching
-devices. But its most frequent use is in using those keys to encrypt and decrypt
-messages.
-
-OpenKeychain integrates with
-
-* K-9 Mail
-* Conversations
-* Password Store
-* oandbackup
-* and many more…
-
-OpenKeychain is designed to be trustworthy. It’s Free Software with no secrets;
-anyone can examine and validate every bit of it.
-
-Permissions:
-
-* Full network access: To query keyservers
-* Near Field Communication: To exchange keys via NFC; Yubikey NEO support
-* Storage: To import/export keys from sd card
-* Identity/Contact: To pre-fill name, email, and search queries; integration with Android's contacts
-.
 
 Repo Type:git
 Repo:https://github.com/open-keychain/open-keychain.git
@@ -360,6 +327,12 @@ Build:4.4.1,44100
     gradle=fdroid
     scanignore=extern/bouncycastle/core/src/test,OpenKeychain/src/test/resources/OpenPGP-Haskell/tests
 
+Maintainer Notes:
+Summary and Description are maintained by upstream using fastlane in
+the source repo:
+https://f-droid.org/docs/All_About_Descriptions_Graphics_and_Screenshots
+.
+
 Auto Update Mode:Version v%v
 Update Check Mode:Tags ^v[0-9.]+$
 Current Version:4.4.1