refactor(util/path): re-export normalizeHastElement from @quartz-community/utils

The normalizeHastElement helper and its internal _rebaseHastElement
have been promoted to @quartz-community/utils so that plugins can
consume the same cross-slug HAST rebasing logic Quartz core uses
for transclude expansion. Previously they lived only in Quartz's
internal util/path module, which out-of-tree plugins (e.g.
canvas-page, whose buildEmbeddedContent embeds vfile.data.htmlAst
from arbitrary pages) could not import from.

normalizeRelativeURLs and its DOM-element sibling _rebaseHtmlElement
stay local - those operate on DOM Elements at runtime, not HAST AST
nodes, and belong with Quartz's DOM-specific code.

package-lock.json

@@ -1857,7 +1857,7 @@
     },
     "node_modules/@quartz-community/utils": {
       "version": "0.1.0",
-      "resolved": "git+ssh://git@github.com/quartz-community/utils.git#4dda81bc82b90f5bceaa3582e81547ce41cc581b",
+      "resolved": "git+ssh://git@github.com/quartz-community/utils.git#83f824b0ad495ae24b7f3524dd2049da76d24c2c",
       "dev": true,
       "license": "MIT",
       "dependencies": {