README: Fix list rendering

The list was previously rendered with "1. ... / 1. ... / 1. ..." instead of "1. ... / 2. ... / 3. ...". I've also removed the `$` prefixes to make it easier to copy-paste the commands.

README.md

@@ -16,20 +16,23 @@ To schedule tasks like fetching ddb data,
 
 ## Installation and Setup
 1. Install python requirements
-```
+
-pip install -r requirements.txt
+    ```
-```
+    pip install -r requirements.txt
+    ```
 
 2. Install redis for asynchronous tasks ('ogn.collect.\*')
-```
+
-$ apt-get install redis-server
+    ```
-```
+    apt-get install redis-server
+    ```
 
 3. Create database
-```
+
-$ ./manage.py db.init
+    ```
-$ alembic stamp head
+    ./manage.py db.init
-```
+    alembic stamp head
+    ```
 
 ## Running the aprs client and task server
 This scripts run in the foreground and should be deamonized