Updated doc

docs/source/index.md

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 :hidden:
 
 installation
+update
 ```
 
 ```{toctree}

docs/source/update.md

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+# Update
+
+Here you will find a short guide on how to update an older version of Geomosaic to the newest one!
+
+
+```{important}
+Execute all the steps with the `geomosaic` conda environment __activated__.
+```
+
+Assuming that you've created the environment by following the guide in the [Installation](installation.md#step-2---install-conda-environment) section, you can activate it with the following command
+
+```bash
+conda activate geomosaic
+```
+
+## Step 1 - Fetch last commits
+Change your current directory to the one that has been created through the [`git clone` (during the installation)](installation.md#step-1---clone-the-repository). If you don't remember where it is located (or if it has been deleted), don't worry you can clone it again
+
+
+::::{tab-set}
+
+:::{tab-item} _Change directory_
+```bash
+cd Geomosaic
+```
+:::
+
+:::{tab-item} _Clone it again_
+```bash
+git clone https://github.com/giovannellilab/Geomosaic.git
+
+cd Geomosaic
+```
+:::
+::::
+
+Now you should _fetch last commits_
+```
+git pull
+```
+
+## Step 2 - update Geomosaic libraries
+
+Staying in the `Geomosaic` directory, in this last step you should update the corresponding python libraries by running the following command
+
+```
+pip install . 
+```
+
+If all the steps have been successfully executed, you should see something like this
+```none
+...
+Successfully built geomosaic
+Installing collected packages: geomosaic
+  Attempting uninstall: geomosaic
+    Found existing installation: geomosaic 1.1.2
+    Uninstalling geomosaic-1.1.2:
+      Successfully uninstalled geomosaic-1.1.2
+Successfully installed geomosaic-1.1.3
+```
+
+That's it!