build(gen): fix markdown toctree

Filename was wrong as well as the format itself.

gen_blogpost.sh

@@ -16,16 +16,16 @@ for dir in "$archive" "$archive/$year" "$archive/$year/$month"; do
 		if [ "$name" = archive ]; then
 			name=Archive
 		fi
-		<<-EOF cat - >"$dir/index.rst"
+		<<-EOF cat - >"$dir/index.md"
 			# $name
 
 			\`\`\`{toctree}
 				---
-				$(printf '\t')glob
-				$(printf '\t')maxdepth: 1
+				maxdepth: 1
+				glob:
 				---
 
-				$(printf '\t')*/index
+				*/index
 			\`\`\`
 		EOF
 	fi