Fix installation instructions and config (#45)

* Update installation instructions

I tried to install a local copy of this project and experienced some problems with the installation instructions.
I updated the instructions with the commands I needed to run to make it work.

* Fix poussetaches docker config

Port 7991 needs to be opened for the poussetaches container to work correctly.

README.md

@@ -68,7 +68,6 @@ Activities are verified using HTTP Signatures or by fetching the content on the
 $ git clone https://github.com/tsileo/microblog.pub
 $ cd microblog.pub
 $ pip install -r requirements.txt
-$ make css
 $ cp -r config/me.sample.yml config/me.yml
 ``` 
 
@@ -107,9 +106,10 @@ The most convenient way to hack on microblog.pub is to run the server locally, a
 # One-time setup
 $ pip install -r requirements.txt
 # Start MongoDB and poussetaches
-$ docker-compose -f docker-compose-dev.yml up -d
+$ make poussetaches
+$ env POUSSETACHES_AUTH_KEY="SetAnyPasswordHere" docker-compose -f docker-compose-dev.yml up -d
 # Run the server locally
-$ FLASK_DEBUG=1 MICROBLOGPUB_DEBUG=1 FLASK_APP=app.py flask run -p 5005 --with-threads
+$ FLASK_DEBUG=1 MICROBLOGPUB_DEBUG=1 FLASK_APP=app.py POUSSETACHES_AUTH_KEY="SetAnyPasswordHere" flask run -p 5005 --with-threads
 ```
 
 ## API

docker-compose-dev.yml

@@ -12,3 +12,5 @@ services:
      - "${DATA_DIR}/poussetaches:/app/poussetaches_data"
     environment:
      - POUSSETACHES_AUTH_KEY=${POUSSETACHES_AUTH_KEY}
+    ports:
+     - "7991:7991"