images: properly scale (near) full-width images

`thulite/images` requires some CSS, which isn't present in our
configuration.[^0] Add it, such that large images are now scaled
properly again.

[^0]: https://images.thulite.io/docs/start-here/manual-setup/#add-css

Signed-off-by: Luca Zeuch <[email protected]>

Author: l-zeuch

assets/scss/components/_images.scss

@@ -0,0 +1,27 @@
+img {
+  height: auto;
+  max-width: 100%;
+}
+
+img, picture {
+  font-size: 0;
+}
+
+img[data-sizes="auto"] {
+  display: block;
+}
+
+.blur-up {
+  filter: blur(5px);
+  transition: filter 400ms;
+}
+
+.blur-up.lazyloaded {
+  filter: unset;
+}
+
+figcaption {
+  font-size: 1rem;
+  margin-top: 0.5rem;
+  font-style: italic;
+}