docs: Postgres certificates (#60)

Author: ZeRego

docs/get-started/setup-lightdash/connect-project.mdx

@@ -290,6 +290,18 @@ You can see more details in [dbt documentation](https://docs.getdbt.com/referenc
 This controls how dbt connects to Postgres databases using SSL.
 You can see more details in [dbt documentation](https://docs.getdbt.com/reference/warehouse-profiles/postgres-profile#sslmode).
 
+#### SSL certificate
+
+The client certificate used to authenticate your connection to the database. This is only required if you're using SSL mode `verify-full`.
+
+#### SSL private key
+
+The private key used to authenticate your connection to the database. This is only required if you're using SSL mode `verify-full`.
+
+#### SSL root certificate
+
+The trusted certificate authority (CA) certificate used to verify the database server’s identity. This is only required if you're using SSL mode `verify-ca` or `verify-full`.
+
 #### Start of week
 
 This controls what day is the start of the week in Lightdash. `Auto` sets it to whatever the default is for your data warehouse. Or, you can customize it and select the day of the week from the drop-down menu. This will be taken into account when using 'WEEK' time interval in Lightdash.