scripts: drop the share-token generator — tokens are gone

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

scripts/new-share-token.mjs

-#!/usr/bin/env node
-// Print a random 6-char share token for an unlisted draft link —
-// paste it as `share:` in the post's frontmatter (node scripts/new-share-token.mjs).
-const alphabet = 'abcdefghijklmnopqrstuvwxyz0123456789';
-
-function pick(count) {
-  const max = 256 - (256 % alphabet.length); // rejection sampling: no modulo bias
-  const bytes = new Uint8Array(count);
-  let n = 0;
-  while (n < count) {
-    crypto.getRandomValues(bytes);
-    for (const byte of bytes) {
-      if (byte < max) {
-        process.stdout.write(alphabet[byte % alphabet.length]);
-        if (++n === count) return;
-      }
-    }
-  }
-}
-
-pick(6);
-console.log();