fin: add page (#3879)

pages/common/fin.md

@@ -0,0 +1,24 @@
+# fin
+
+> Docksal command line utility.
+> More information: <https://docs.docksal.io/fin/fin/>.
+
+- Start the project in the current directory:
+
+`fin project start`
+
+- Stop the project in the current directory:
+
+`fin project stop`
+
+- Open a shell into a specific container:
+
+`fin bash {{container_name}}`
+
+- Display logs of a specific container:
+
+`fin logs {{container_name}}`
+
+- Display logs of a specific container and follow the log:
+
+`fin logs -f {{container_name}}`