[website] more aggressive cache purge

docs/tools/release.sh

@@ -44,7 +44,7 @@ then
     if [[ ! -z "${CLOUDFLARE_TOKEN}" ]]
     then
         sleep 1m
-        git diff --stat="9999,9999" --diff-filter=M HEAD~1 | grep '|' | awk '$1 ~ /\.html$/ { if ($3>8) { url="https://content.clickhouse.tech/"$1; sub(/\/index.html/, "/", url); print "\""url"\""; }}' | split -l 25 /dev/stdin PURGE
+        git diff --stat="9999,9999" --diff-filter=M HEAD~1 | grep '|' | awk '$1 ~ /\.html$/ { if ($3>6) { url="https://content.clickhouse.tech/"$1; sub(/index.html/, "", url); print "\""url"\""; }}' | split -l 25 /dev/stdin PURGE
         for FILENAME in $(ls PURGE*)
         do
             POST_DATA=$(cat "${FILENAME}" | sed -n -e 'H;${x;s/\n/,/g;s/^,//;p;}' | awk '{print "{\"files\":["$0"]}";}')