Improve starter documentation and remove sandbox link (#2095)

Signed-off-by: Avgustin Marinov <Avgustin.Marinov@bosch.com>

site/content/gettingstarted.md

@@ -21,26 +21,67 @@ Start the hawkBit Update Server as a single container
 ```bash
 $ docker run -p 8080:8080 hawkbit/hawkbit-update-server:latest
 ```
+This will start hawkBit update server with embedded H2 database for evaluation purposes.
 
 ### B: Run hawkBit Update Server (Monolith) with services as Docker Compose
-
+Start the hawkBit Update Server together with an PostgreSQL and RabbitMQ instance as containers
-Start the hawkBit Update Server together with an MySQL and RabbitMQ instance as containers
 
 ```bash
 $ git clone https://github.com/eclipse-hawkbit/hawkbit.git
-$ cd hawkbit/hawkbit-runtime/docker
+$ cd hawkbit/docker
+$ docker-compose -f docker-compose-monolith-postgres.yml up -d
+```
+or with MySQL
+```bash
+$ git clone https://github.com/eclipse-hawkbit/hawkbit.git
+$ cd hawkbit/docker
 $ docker-compose -f docker-compose-monolith-mysql.yml up -d
 ```
 
-### C: Run hawkBit Update Server (Micro-Service) with services as Docker Compose
+If you want to start also the Simple UI, you can use, for PostgreSQL:
+```bash
+$ git clone https://github.com/eclipse-hawkbit/hawkbit.git
+$ cd hawkbit/docker
+$ docker-compose -f docker-compose-monolith-with-simple-ui-postgres.yml up -d
+```
+or with MySQL
+```bash
+$ git clone https://github.com/eclipse-hawkbit/hawkbit.git
+$ cd hawkbit/docker
+$ docker-compose -f docker-compose-monolith-simple-ui-mysql.yml up -d
+```
 
-Start the hawkBit Update Server together with an MySQL and RabbitMQ instance as containers
+Note: _-d_ flag is used to run the containers in detached mode. If you want to see the logs, you can remove the flag.
+
+### C: Run hawkBit Update Server (Micro-Service) with services as Docker Compose
+Start the hawkBit Update Server together with an PostgreSQL and RabbitMQ instance as containers
 
 ```bash
 $ git clone https://github.com/eclipse-hawkbit/hawkbit.git
-$ cd hawkbit/hawkbit-runtime/docker
+$ cd hawkbit/docker
-$ docker-compose -f docker-compose-micro-service-mysql.yml up -d
+$ docker-compose -f docker-compose-micro-services-postgres.yml up -d
 ```
+or with MySQL
+```bash
+$ git clone https://github.com/eclipse-hawkbit/hawkbit.git
+$ cd hawkbit/docker
+$ docker-compose -f docker-compose-micro-services-mysql.yml up -d
+```
+
+If you want to start also the Simple UI, you can use, for PostgreSQL:
+```bash
+$ git clone https://github.com/eclipse-hawkbit/hawkbit.git
+$ cd hawkbit/docker
+$ docker-compose -f docker-compose-micro-services-with-simple-ui-postgres.yml up -d
+```
+or with MySQL
+```bash
+$ git clone https://github.com/eclipse-hawkbit/hawkbit.git
+$ cd hawkbit/docker
+$ docker-compose -f docker-compose-micro-services-simple-ui-mysql.yml up -d
+```
+
+Note: _-d_ flag is used to run the containers in detached mode. If you want to see the logs, you can remove the flag.
 
 ## From Sources
 
@@ -58,7 +99,26 @@ $ mvn clean install -DskipTests
 $ java -jar ./hawkbit-monolith/hawkbit-update-server/target/hawkbit-update-server-0-SNAPSHOT.jar
 ```
 
-### 3: Change credentials
+Note: you could start it also in microservices mode by:
+```sh
+$ java -jar ./hawkbit-mgmt/hawkbit-mgmt-server/target/hawkbit-mgmt-server-0-SNAPSHOT.jar
+```
+```sh
+$ java -jar ./hawkbit-ddi/hawkbit-ddi-server/target/hawkbit-ddi-server-0-SNAPSHOT.jar
+```
+and (only if you want to use the DMF feature):
+
+```sh
+$ java -jar ./hawkbit-dmf/hawkbit-dmf-server/target/hawkbit-dmf-server-0-SNAPSHOT.jar
+```
+
+Note: you could starte the Simple UI by:
+```sh
+$ java -jar ./hawkbit-simple-ui/target/hawkbit-simple-ui-0-SNAPSHOT.jar
+```
+
+## Configuration
+### Change credentials
 As stated before the default user is _admin/admin_. It could be overridden by changing the [TenantAwareUserProperties](https://github.com/eclipse-hawkbit/hawkbit/blob/master/hawkbit-core/src/main/java/org/eclipse/hawkbit/tenancy/TenantAwareUserProperties.java) configuration using Spring ways. For instance, using a properties file like:
 ```properties 
 # should remove the admin/admin user

site/layouts/partials/drawer.html

@@ -19,12 +19,7 @@
   <div class="scrollable">
     <div class="wrapper">
       {{ if (eq (trim .Site.Params.provider " " | lower) "github") | and (isset .Site.Params "repo_url") }}
-        <ul class="repo">
+        <ul class="repo" style="text-align: left; ; padding-left: 2em;">
-          <li class="repo-download">
-            <a href="https://hawkbit.eclipseprojects.io" target="_blank" title="hawkBit Sandbox" data-action="sandbox">
-              <i class="fas fa-desktop"></i> &nbsp; Sandbox
-            </a>
-          </li>
           <li class="repo-stars">
             <a href="{{ .Site.Params.repo_url }}/stargazers" target="_blank" title="Stargazers" data-action="star">
               <i class="icon icon-star"></i> Stars