fidelity: fix eval edge case (via wombat), enable http->https check for wacz sources (via wabac.js)

dependency updates:
- switch to webpack 5 and related build dependencies
- update litelement -> 'lit'
- wabac.js 2.9.2, wombat 1.3.4

search:
- update to latest flexsearch
- optimize search by using single-field index

bump to 1.5.3

src/coll-index.js

@@ -1,4 +1,4 @@
-import { LitElement, html, css } from "lit-element";
+import { LitElement, html, css } from "lit";
 import { wrapCss, apiPrefix } from "./misc";
 
 import prettyBytes from "pretty-bytes";