striving for consistency across various docs

Signed-off-by: Claudius <opensource@amenthes.de>

docs/setup/cloudron.md

@@ -1,4 +1,5 @@
-## Cloudron
+Cloudron
+===
 
 Install CodiMD on [Cloudron](https://cloudron.io):
 

docs/setup/docker.md

@@ -1,5 +1,6 @@
+CodiMD by docker container
+===
 
-## CodiMD by docker container
 [![Try in PWD](https://cdn.rawgit.com/play-with-docker/stacks/cff22438/assets/images/button.png)](http://play-with-docker.com?stack=https://github.com/codimd/container/raw/master/docker-compose.yml&stack_name=codimd)
 
 
@@ -14,9 +15,9 @@
 
 The easiest way to setup CodiMD using docker are using the following three commands:
 
-```console
+```sh
 git clone https://github.com/codimd/container.git
 cd codimd-container
 docker-compose up
 ```
-Read more about it in the [container repository…](https://github.com/codimd/container)
+Read more about it in the [container repository](https://github.com/codimd/container).

docs/setup/heroku.md

@@ -1,4 +1,5 @@
-## Heroku Deployment
+Heroku Deployment
+===
 
 You can quickly setup a sample Heroku CodiMD application by clicking the button
 below.

docs/setup/kubernetes.md

@@ -1,4 +1,5 @@
-## Kubernetes
+Kubernetes
+===
 
 To install use `helm install stable/hackmd`.
 

docs/setup/manual-setup.md

@@ -1,4 +1,5 @@
-# Manual Installation
+Manual Installation
+===
 
 ## Requirements on your server
 
@@ -8,6 +9,7 @@
 - `libssl-dev` for building scrypt (see [here](https://github.com/ml1nk/node-scrypt/blob/master/README.md#installation-instructions) for further information)
 - For **building** CodiMD we recommend to use a machine with at least **2GB** RAM
 
+
 ## Instructions
 
 1. Download a release and unzip or clone into a directory