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/story.js

@@ -1,7 +1,7 @@
-import { LitElement, html, css, unsafeCSS } from "lit-element";
+import { LitElement, html, css, unsafeCSS } from "lit";
 import { wrapCss } from "./misc";
 
-import { unsafeHTML } from "lit-html/directives/unsafe-html";
+import { unsafeHTML } from "lit/directives/unsafe-html.js";
 import marked from "marked";
 
 import { getTS, getReplayLink } from "./pageutils";
@@ -397,4 +397,4 @@ class Story extends LitElement
 
 customElements.define("wr-coll-story", Story);
 
-export { Story };
+export { Story };