feat: update image handling

- removes old image shortcode
- update to latest 11ty image transform plugin

package.json

@@ -15,7 +15,7 @@
   "devDependencies": {
     "@11ty/eleventy": "^3.0.0",
     "@11ty/eleventy-fetch": "^4.0.0",
-    "@11ty/eleventy-img": "^3.1.8",
+    "@11ty/eleventy-img": "^5.0.0",
     "@11ty/eleventy-plugin-rss": "^1.2.0",
     "autoprefixer": "^10.4.17",
     "cheerio": "^1.0.0-rc.12",
@@ -31,6 +31,7 @@
     "markdown-it-abbr": "^2.0.0",
     "markdown-it-anchor": "^8.6.7",
     "markdown-it-footnote": "^4.0.0",
+    "markdown-it-image-figures": "^2.1.1",
     "markdown-it-prism": "^2.3.0",
     "pluralize": "^8.0.0",
     "postcss": "^8.4.33",