feat: find a file by any hash, out of the search

Hashes, link lists, install commands, member tables and long reference
tables leave the site search: the index drops from 21.0 MB (4.88 MB
gzip) to 6.8 MB (1.33 MB gzip). Names and prose stay searchable.

files/?hash= takes a SHA1, MD5, CRC32 or SHA256 and reads one shard of
api/v1/lookup/ (about 22 KB gzip, was 675 KB) listing the collection
card, the platforms that declare the value and the profiles that check
it. files/?sha1= still opens the card, and a sha1- anchor missing from
a page is looked up there, so a card can move between pages.

Excluded blocks are section elements: the search plugin compares
elements by tag, so a div ended at the first nested div.

scripts/exporter/candidates.py

@@ -12,6 +12,7 @@ the platform names that no profile describes leaves the verdict open.
 from __future__ import annotations
 
 import sys
+from collections.abc import Iterable
 from dataclasses import dataclass, field
 from pathlib import Path
 
@@ -168,7 +169,7 @@ class ProofIndex:
                     if len(value) >= length:
                         self._index["cut"].setdefault(value[:length], set()).add(position)
 
-    def _hits(self, kind: str, keys) -> set[int]:
+    def _hits(self, kind: str, keys: Iterable[str]) -> set[int]:
         table = self._index[kind]
         found: set[int] = set()
         for key in keys: