feat: HedgeDoc module(#168)

Reviewed-on: https://git.selfprivacy.org/SelfPrivacy/selfprivacy-nixos-config/pulls/168
Reviewed-by: Inex Code <inex.code@selfprivacy.org>
Co-authored-by: Thary <thary@riseup.net>
Co-committed-by: Thary <thary@riseup.net>

sp-modules/hedgedoc/config-paths-needed.json

@@ -0,0 +1,11 @@
+[
+  [ "selfprivacy", "domain" ],
+  [ "selfprivacy", "modules", "auth", "enable" ],
+  [ "selfprivacy", "modules", "hedgedoc" ],
+  [ "selfprivacy", "passthru", "auth", "mkOAuth2ClientSecretFP" ],
+  [ "selfprivacy", "passthru", "auth", "oauth2-discovery-url" ],
+  [ "selfprivacy", "passthru", "auth", "oauth2-provider-name" ],
+  [ "selfprivacy", "sso", "enable" ],
+  [ "selfprivacy", "useBinds" ],
+  [ "services", "kanidm", "serverSettings", "origin" ]
+]