add missing doc

docs/_sources/troubleshooting/administrator.rst.txt

@@ -0,0 +1,10 @@
+Administrator
+#############
+
+
+`JSON.parse: unexpected character at line 1 column 1 of the JSON data`
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+On the **Network Tab**, if the requests are made to `http://localhost:3000/undefined/api`, that means the environnement variable **REACT_APP_API_URL** is not initialized.
+
+Check if **Makefile.custom.config** file exists and **REACT_APP_API_URL** is correctly initialized (see `example <https://github.com/SamR1/FitTrackee/blob/master/Makefile.custom.config.example>`__), and rebuild the client.

docs/_sources/troubleshooting/index.rst.txt

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+Troubleshooting
+#################
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Endpoints:
+
+   administrator
+   user

docs/_sources/troubleshooting/user.rst.txt

@@ -0,0 +1,5 @@
+User
+####
+
+
+``TODO``