Move index.html to repo root, fix Writings paths

Coolify serves from repo root — index.html at root means
spaces.exopraxist.org/ works directly. Writings hrefs updated
from ../Writings/ to Writings/ accordingly.

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

.gitignore

@@ -1,3 +1,19 @@
+# Old site/ build dir — index.html now lives at repo root
+site/
+
+# Agent workspace — not for deployment
+skills/
+spores/
+CREATURE-PLAYGROUND/
+DumperCan/
+PARENT.md
+SONNET.md
+GEMINI.md
+SPORE_SYSTEM_SPEC_v0.2.md
+SEEDS.md
+*-JL-notes.md
+HomePage-JL-notes.md
+
 # Large media files — use FileBrowser (files.exopraxist.org) instead
 *.jpg
 *.JPG