docs: add docs base

cells/repo/docs.nix

@@ -0,0 +1,45 @@
+{inputs, ...}: let
+  inherit (inputs) doclib;
+in
+  (doclib.mkDocs {
+    docs."default" = {
+      base = "${inputs.self}";
+      path = "${inputs.self}/docs";
+      material = {
+        enable = true;
+        colors = {
+          primary = "deep purple";
+          accent = "purple";
+        };
+        umami = {
+          enable = true;
+          src = "https://analytics.tf/umami";
+          siteId = "219a2bbe-e421-420c-a25c-e168b16d8b61";
+          domains = ["rensa.projects.tf"];
+        };
+      };
+      config = {
+        site_name = "Rensa Core";
+        repo_name = "rensa-nix/core";
+        repo_url = "https://gitlab.com/rensa-nix/core";
+        theme = {
+          logo = "images/logo.png";
+          icon.repo = "simple/gitlab";
+          favicon = "images/favicon.png";
+        };
+        nav = [
+          {"Introduction" = "index.md";}
+        ];
+        markdown_extensions = [
+          {
+            "pymdownx.highlight".pygments_lang_class = true;
+          }
+          "pymdownx.inlinehilite"
+          "pymdownx.snippets"
+          "pymdownx.superfences"
+          "pymdownx.escapeall"
+          "fenced_code"
+        ];
+      };
+    };
+  }).packages