docs: real repo url + pip install command

point install at git.rethinkstudios.io; show both the requirements.txt
line and the direct pip install command.

Signed-off-by: disqualifier <dev@disqualifier.me>

README.md

@@ -5,9 +5,16 @@ helpers for the common paths, with a raw escape hatch for everything else.
 
 ## Install
 
+`requirements.txt`:
+
+```
+mongo @ git+https://git.rethinkstudios.io/rethink-public/mongo@v0.1.0
+```
+
+Direct:
+
 ```bash
-# requirements.txt
-mongo @ git+ssh://git@github.com/<org>/mongo.git@v0.1.0
+pip install "mongo @ git+https://git.rethinkstudios.io/rethink-public/mongo@v0.1.0"
 ```
 
 Requires `motor` and `pymongo` (pulled transitively).