Added "Migrating to Python3" to the docs index

docs/installation/migrating-to-python3.md

@@ -1,27 +1,33 @@
 # Migration
+
 Remove Python 2 packages
+
 ```no-highlight
 # apt-get remove --purge -y python-dev python-pip
 ```
 
 Install Python 3 packages
+
 ```no-highlight
 # apt-get install -y python3 python3-dev python3-pip
 ```
 
 Install Python Packages
+
 ```no-highlight
 # cd /opt/netbox
 # pip3 install -r requirements.txt
 ```
 
 Gunicorn Update
-```
+
+```no-highlight
 # pip uninstall gunicorn
 # pip3 install gunicorn
 ```
 
-Re-install LDAP Module (Optional if using LDAP for auth)
-```
+Re-install LDAP Module (optional if using LDAP for auth)
+
+```no-highlight
 sudo pip3 install django-auth-ldap
 ```