use "Level 0" for readability, include links to participating agents

doc/features.rst

@@ -30,10 +30,17 @@ from previous ones here are some of its features:
   tell each other how and when to encrypt to each other
   by attaching neccessary information along with mails.
 
-- **Implement and specify "level0" support in several MUAs in spring
-  2017.**  Keep level0 minimal enough that it's easy for developers to
+- **Implement and specify "Level 0" support in several MUAs in spring
+  2017.** Keep Level 0 minimal enough that it's easy for developers to
   adopt it and we can start to drive efforts from real-life experiences.
-  Currently involved are developers from K9/Android, Enigmail, Mailpile, 
-  Bitmask/LEAP and others who are interested to add support for OSX 
-  or write reference "MUA bots" in Python or Go.
+  Currently involved are developers from `K9/Android`_, `Enigmail`_,
+  `Mailpile`_, `Bitmask/LEAP`_ and others who are interested to add
+  support for OSX or write reference "MUA bots" in `Python`_ or `Go`_.
 
+.. _`K9/Android`: https://k9mail.github.io/
+.. _`Enigmail`: https://enigmail.net/
+.. _`Mailpile`: https://mailpile.is/
+.. _`Bitmask/LEAP`: https://leap.se/en/docs/client
+
+.. _`Python`: https://www.python.org/
+.. _`Go`: https://golang.org/

doc/pgp-interop.rst

@@ -18,8 +18,8 @@ should my own Autocrypt keys appear in my keyring?
 
 can I put my regular pgp keys into Autocrypt?
 
-- MUAs should not provide UI for importing keys for level1
-- allowed for level0 to get traction early on (as replacement for keyservers)
+- MUAs should not provide UI for importing keys for Level 1
+- allowed for Level 0 to get traction early on (as replacement for keyservers)
 
 can I use someone's pgp key that i have for encrypting mail to that person?