modified: eleventy.config.js

uncommenting L35 of eleventy.config.js `eleventy-img/*.webc` breaks build

```diff
+	eleventyConfig.addPlugin(pluginWebc, {
+		components: [
+			"./_components/**/*.webc",
+			// "npm:@11ty/eleventy-img/*.webc",
+		],
+	});
```

> [11ty] Original error stack trace: Error: Check the webc:type="js" element in
./content/archive/fourthpost/fourthpost.md.

> [11ty] Original error message: Cannot read properties of undefined
(reading 'directories')

Seems like it is getting hung up here:
https://github.com/11ty/eleventy-img/blob/main/eleventy-image.webc#L72-L81

modified: content/archive/fourthpost/fourthpost.md

```diff
-{% image "./possum.png", "A possum parent and two possum kids hanging from the iconic red balloon" %}
+<img webc:is="eleventy-image" width="288,350" sizes="100vw" src="/img/possum.png" formats="avif,webp,png" alt="A possum parent and two possum kids hanging from the iconic red balloon">
```

modified: package.json

added webc plugin

new file: _components/html/h2.webc
new file: _components/html/h3.webc
new file: _components/html/h4.webc
new file: _components/html/heading.css
renamed:  content/archive/fourthpost/possum.png -> public/img/possum.png

_components/html/h2.webc: `console.log(slots.text.default);`

See 11ty/webc#151 for more on collisions