Docs: Fix image locations for installation chapter

doc/02-installation.md

@@ -549,7 +549,7 @@ Test it:
 # vim /etc/icinga2/conf.d/templates.conf
 ```
 
-![Vim with syntax highlighting](images/getting-started/vim-syntax.png "Vim with Icinga 2 syntax highlighting")
+![Vim with syntax highlighting](images/installation/vim-syntax.png "Vim with Icinga 2 syntax highlighting")
 
 
 ### Configuration Syntax Highlighting using Nano <a id="configuration-syntax-highlighting-nano"></a>
@@ -593,7 +593,7 @@ Test it:
 $ nano /etc/icinga2/conf.d/templates.conf
 ```
 
-![Nano with syntax highlighting](images/getting-started/nano-syntax.png "Nano with Icinga 2 syntax highlighting")
+![Nano with syntax highlighting](images/installation/nano-syntax.png "Nano with Icinga 2 syntax highlighting")
 
 ## Setting up Icinga Web 2 <a id="setting-up-icingaweb2"></a>
 
@@ -704,7 +704,7 @@ GRANT SELECT, INSERT, UPDATE, DELETE, DROP, CREATE VIEW, INDEX, EXECUTE ON icing
 quit
 ```
 
-![setting up the database on CentOS 7](images/getting-started/mariadb-centos7.png "Setting up the database on CentOS 7")
+![setting up the database on CentOS 7](images/installation/mariadb-centos7.png "Setting up the database on CentOS 7")
 
 After creating the database you can import the Icinga 2 IDO schema using the
 following command. Enter the root password into the prompt when asked.
@@ -876,7 +876,7 @@ export PGPASSWORD=icinga
 psql -U icinga -d icinga < /usr/share/icinga2-ido-pgsql/schema/pgsql.sql
 ```
 
-![importing the Icinga 2 IDO schema](images/getting-started/postgr-import-ido.png "Importing the Icinga 2 IDO schema on Debian Jessie")
+![importing the Icinga 2 IDO schema](images/installation/postgr-import-ido.png "Importing the Icinga 2 IDO schema on Debian Jessie")
 
 
 #### Enabling the IDO PostgreSQL module <a id="enabling-ido-postgresql"></a>