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/pageentry.js

@@ -1,6 +1,6 @@
 import prettyBytes from "pretty-bytes";
 
-import { LitElement, html, css, unsafeCSS } from "lit-element";
+import { LitElement, html, css, unsafeCSS } from "lit";
 
 import "keyword-mark-element/lib/keyword-mark.js";