Update all git clone urls in docs to work without needing to register ssh keys with gitlab, instead using the https url anyone can clone the public repo without having to register with gitlab.

docs/development/development-environment.md

@@ -48,7 +48,7 @@ Baserow's code to your computer.
 
 ```
 $ cd ~/baserow
-$ git clone git@gitlab.com:bramw/baserow.git
+$ git clone https://gitlab.com/bramw/baserow.git
 Cloning into 'baserow'...
 ...
 $ cd baserow

docs/guides/installation/install-on-ubuntu.md

@@ -81,7 +81,7 @@ $ sudo -i
 # Clone the baserow project
 $ mkdir /baserow
 $ cd /baserow
-$ git clone https://gitlab.com/bramw/baserow/ .
+$ git clone https://gitlab.com/bramw/baserow.git .
 ```
 
 The password used for the `baserow` user does not have to be the same as the one used

docs/plugins/boilerplate.md

@@ -15,7 +15,7 @@ python and pip.
 ```
 $ cd ~/baserow
 $ pip install cookiecutter
-$ git clone git@gitlab.com:bramw/baserow.git
+$ git clone https://gitlab.com/bramw/baserow.git
 Cloning into 'baserow'...
 ```