Set Home root nav and remove top tabs

Define Home as the top-level root page in zensical nav and remove navigation.tabs to avoid top tab navigation on home.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

.github/zensical.toml

@@ -2,6 +2,9 @@
 site_name = "-{{ REPO_NAME }}-"
 repo_name = "-{{ REPO_OWNER }}-/-{{ REPO_NAME }}-"
 repo_url = "https://github.com/-{{ REPO_OWNER }}-/-{{ REPO_NAME }}-"
+nav = [
+  {"Home" = "index.md"},
+]
 
 [project.theme]
 language = "en"
@@ -22,7 +25,6 @@ features = [
   "navigation.instant",
   "navigation.instant.progress",
   "navigation.indexes",
-  "navigation.tabs",
   "navigation.top",
   "navigation.tracking",
   "search.share",