Merge 'Occupation' and 'Background'

We have little information on 'Occupation' and it would fit better in a
demographic summary of the persona.

wiki/src/blueprint/personas.mdwn

@@ -276,8 +276,6 @@ developed by SecondMuse):
 
 ## Kim
 
-- **Occupation**
-
 - **Background**
 
   - Kim is a gay youth from Nigeria that has been institutionalized.
@@ -355,14 +353,11 @@ developed by SecondMuse):
 
 ## Cris
 
-- **Occupation**
+- **Background**
 
   - Cris is an investigative journalist doing high stake reporting on
     the government, and in particular some members of the government who
     are involved in corruption, drug and human trafficking.
-
-- **Background**
-
   - Cris lives in Mexico and reports on the mafia and drug related
     corruption of politicians.
   - Cris is visiting the country to interview locals and needs to get
@@ -427,13 +422,10 @@ developed by SecondMuse):
 
 ## Riou
 
-- **Occupation**
-
-  Riou is a student in Hong Kong, who participates in the Umbrella
-  movement.
-
 - **Background**
 
+  - Riou is a student in Hong Kong, who participates in the Umbrella
+    movement.
   - Riou organizes a public massive protest against new government
     policies and laws. The organizers need to be stealthy and anonymous,
     but the protest needs to be public and advertised. The organizers
@@ -441,7 +433,6 @@ developed by SecondMuse):
     public so that citizens actually know where to show up. In order to
     publish this information they use websites which are not in the
     country, so that the government cannot censor this information.
-
   - During the protest they leave their phones at home. They are doing
     most of their communication beforehand. Although they take photos
     and videos of the protests and try to publish this information on
@@ -496,12 +487,9 @@ developed by SecondMuse):
 
 ## Derya
 
-- **Occupation**
-
-  - Derya is a content writer for an e-commerce website.
-
 - **Background**
 
+  - Derya is a content writer for an e-commerce website.
   - Derya is a Turkish refugee living in Germany.
   - Derya contributes to free software projects in their free time. For
     example, they translate lots of software into Turkish.