Fix title levels in manual.md

skeleton/pages/manual.md

@@ -7,9 +7,9 @@ parent: home
 
 This course content is provided as Jupyter notebooks that require to be powered by a Jupyter server with Python3 kernel.
 
-## Install Jupyter
+### Install Jupyter
 
-### First install Anaconda
+#### First install Anaconda
 
 [Anaconda](https://www.anaconda.com/distribution) is complete and easy to install.
 In particular, it is shipped with:
@@ -20,7 +20,7 @@ In particular, it is shipped with:
 
 For a detailed installation of Anaconda and its extensions on Windows, Mac or Linux, follow the <a href="pages/anaconda.md"><img src="fig/anaconda.png" style="display:inline" alt="Anaconda logo" width="100px"></a> instructions.
 
-### Finalize installation with conda
+#### Finalize installation with conda
 
 From the project root directory, type:
 
@@ -28,7 +28,7 @@ From the project root directory, type:
 conda install --file requirements.txt
 ```
 
-## Run a Jupyter server
+### Run a Jupyter server
 
 - Either from Anaconda graphical interface
 - or the command line interface from the project root directory: