Archive snapshots of websites locally (#672)

* Add basic HTML snapshots

* Implement asset list

* Add snapshot creation tests

* Add deletion tests

* Show file size

* Remove snapshots

* Create new snapshots

* Switch to single-file

* CSS tweak

* Remove auto refresh

* Show delete link when there is no file yet

* Add current date to display name

* Add flag for snapshot support

* Add option for disabling automatic snapshots

* Make snapshots sharable

* Document image variants

* Update README.md

* Add migrations

* Fix tests

bookmarks/frontend/behaviors/bookmark-page.js

@@ -1,4 +1,4 @@
-import { registerBehavior, swap } from "./index";
+import { registerBehavior, swapContent } from "./index";
 
 class BookmarkPage {
   constructor(element) {
@@ -37,8 +37,8 @@ class BookmarkPage {
       fetch(`${bookmarksUrl}${query}`).then((response) => response.text()),
       fetch(`${tagsUrl}${query}`).then((response) => response.text()),
     ]).then(([bookmarkListHtml, tagCloudHtml]) => {
-      swap(this.bookmarkList, bookmarkListHtml);
-      swap(this.tagCloud, tagCloudHtml);
+      swapContent(this.bookmarkList, bookmarkListHtml);
+      swapContent(this.tagCloud, tagCloudHtml);
 
       // Dispatch list updated event
       const listElement = this.bookmarkList.querySelector(