Revert "remove explicit img sizing (initial value is auto)"

This reverts commit c41ae4c.

Need to keep `img { height: auto; width: auto; }`
to unset the `[height]` and `[width]` attributes of <img> elements.

css/src/_base.less

@@ -532,10 +532,13 @@ select[multiple] > optgroup > option {
 //++++++++++++++++++++++++++++++++//
 //    # EMBEDDED
 //++++++++++++++++++++++++++++++++//
+// [1] Correct squishing when one dimension changes (override `[height]`/`[width]` attributes)
 // [2] fluid images for responsive purposes
 // [3] offset `[alt]` attribute text from surrounding copy
 // [4] safer alternative to `display: block;`
 img {
+	height: auto; width: auto; // COMBAK{FALLBACK}
+	block-size: auto; inline-size: auto; // [1]
 	max-width: 100%; // COMBAK{FALLBACK}
 	@supports (max-inline-size: 1%) {
 		max-width: unset;