chore: Configure Renovate (#15)

* Add renovate.json

* remove default preset, add nix, allow non-office hours

Signed-off-by: strawberry <strawberry@puppygock.gay>

* enable lockfile maintenance

Signed-off-by: strawberry <strawberry@puppygock.gay>

* will this make nix work

Signed-off-by: strawberry <strawberry@puppygock.gay>

---------

Signed-off-by: strawberry <strawberry@puppygock.gay>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: strawberry <strawberry@puppygock.gay>

renovate.json

+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "schedule": [
+    "at any time"
+  ],
+  "lockFileMaintenance": {
+    "enabled": true,
+    "schedule": [
+      "at any time"
+    ]
+  },
+  "nix": {
+    "schedule": [
+      "at any time"
+    ],
+    "enabled": true
+  },
+  "enabledManagers": [
+    "github-actions",
+    "nix"
+  ]
+}