uses dotenv to store api key and other important variables

if a value is not found in .env it will be prompted, but not checked
next step is user docs

src/APIHandler.py

@@ -1,4 +1,5 @@
 import os, requests
+from dotenv import load_dotenv
 from getpass import getpass
 import elabapi_python as elabapi
 
@@ -20,10 +21,13 @@ class APIHandler:
     """
 
     # TO-DO: remove static url.
-    def __init__(
-        self, api_key="", ELABFTW_API_URL="https://elabftw.fisica.unina.it/api/v2"
-    ):
+    def __init__(self, api_key="", ELABFTW_API_URL=None):
         """Init method, api_key suggested but not required (empty by default)."""
+        if not ELABFTW_API_URL:
+            load_dotenv()
+            ELABFTW_API_URL = os.getenv("ELABFTW_API_URL") or input(
+                "Enter a valid eLabFTW API URL (ends with '/api/v2)': "
+            )
         self.api_key = api_key
         self.auth = {"Authorization": api_key}
         self.content = {"Content-Type": "application/json"}