feat: publish manifests, id indexes and licence

The CSV and SQLite carry zipped_file and the Recalbox flags, contracts
leave registry keys in a registry field and validate, every envelope
carries commit, lookup URLs are site-absolute, systems.json and
cores.json answer an id, the Data page shows the manifest fields and a
folder check, and platform overviews link emulators by name.

tests/test_site_platform_hashes.py

@@ -69,8 +69,9 @@ class AnUntestedRowNamesBothHashes(unittest.TestCase):
         db = {"files": {"f" * 40: {"path": path, "sha256": held}}}
         table = "\n".join(gs._render_problem_files([problem], db=db))
         row = next(line for line in table.splitlines() if "dsifirmware" in line)
-        self.assertIn(f"sha256 `{declared}`", row)
-        self.assertIn(f"sha256 `{held}`", row)
+        # Cut to 12 characters in the cell, the whole value in its title.
+        self.assertIn(f'sha256 <code title="{declared}">{declared[:12]}</code>', row)
+        self.assertIn(f'sha256 <code title="{held}">{held[:12]}</code>', row)
         self.assertIn(f"`{path}`", row)