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/flake.nix

@@ -0,0 +1,39 @@
+{
+  description = "HedgeDoc module";
+
+  outputs = { ... }:
+    {
+      nixosModules.default = import ./module.nix;
+      configPathsNeeded = builtins.fromJSON (builtins.readFile ./config-paths-needed.json);
+      meta =
+        { lib, ... }:
+        {
+          spModuleSchemaVersion = 1;
+          id = "hedgedoc";
+          name = "HedgeDoc";
+          description = "HedgeDoc is an open-source, web-based, self-hosted, collaborative markdown editor.";
+          svgIcon = builtins.readFile ./icon.svg;
+          isMovable = true;
+          isRequired = false;
+          backupDescription = "Notes and attachments.";
+          systemdServices = [
+            "hedgedoc.service"
+          ];
+          folders = [
+            "/var/lib/hedgedoc"
+          ];
+          postgreDatabases = [
+            "hedgedoc"
+          ];
+          license = [
+            lib.licenses.agpl3Only
+          ];
+          homepage = "https://hedgedoc.org";
+          sourcePage = "https://github.com/hedgedoc/hedgedoc";
+          supportLevel = "normal";
+          sso = {
+            userGroup = "sp.hedgedoc.users";
+          };
+        };
+    };
+}