feat(plugins/astrocore): fully configure as in astronvim

plugins/astrocore/features.nix

@@ -0,0 +1,25 @@
+# https://github.com/AstroNvim/AstroNvim/blob/v4.7.7/lua/astronvim/plugins/_astrocore.lua#L32-L39
+{
+  features = {
+    # Enable autopairs at start
+    autopairs = true;
+
+    # Enable completion at start
+    cmp = true;
+
+    # Enable diagnostics by default
+    diagnostics_mode = 3;
+
+    # Highlight URLs by default
+    highlighturl = true;
+
+    # Disable notifications
+    notifications = true;
+
+    # Set global limits for large files
+    large_buf = {
+      lines = 10000;
+      size = 1024 * 500;
+    };
+  };
+}