refactor: prefix post folders with date, lock permalinks via slug

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

content/posts/2026-04-26-etheral-nightmare/index.md

@@ -0,0 +1,15 @@
+---
+title:       "Ethereal Nightmare"
+description: "A dark fantasy digital painting of a reimagined Neuschwanstein Castle as the seat of Count Dracula. The architecture is elongated and skeletal, with impossible gothic arches and spiked battlements. A giant, glowing crimson moon hangs directly behind the tallest tower, silhouetting thousands of bats erupting into the night. Cascades of dead ivy and withered black roses drape over the balconies. The surrounding forest is twisted and leafless. Intricate filigree, glowing runes on the stone, vibrant but dark color palette, Greg Rutkowski style."
+date:        2026-04-26
+author:      "valknar"
+featured:    false
+categories:
+  - Dark
+tags:
+  - Neuschwanstein Castle
+  - Vampire
+  - Gothic
+  - Rutkowski
+slug: etheral-nightmare
+---