[DOCS] Small updates

docs/source/configuration.md

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+# Configuration
+
+After installing the Network Mapper, some configuration must be done in the web interface. You will need to log in with an admin account.
+
+:::{important}
+Admin dashboard: this is the admin section of the site, accessed by clicking `Admin` on the navigation bar at the top.
+:::
+
+## Federated Login
+
+Federated login is supported for Google an Microsoft accounts, and can be set up through the `Social Accounts` section of the admin dashboard.