normalize wiki names

wiki/build-wiki.sh

@@ -1,10 +1,14 @@
 #!/bin/sh
 
+printf "removing previous html build artifacts"
+rm *.html
+
 for page in source/*.md; do
     pagename=$(basename $page ".md")
     printf "building %s wiki article\n" "$pagename"
 
     pandoc \
+        --toc \
         --template wiki.tmpl \
         --lua-filter header-permalinks.lua \
         -T "tilde.club wiki | " \