chore(): Update markdown styles, bump theme dep

Author: jaredcbaum

package.json

@@ -22,7 +22,7 @@
     "@docusaurus/core": "2.0.0-beta.3",
     "@docusaurus/preset-classic": "2.0.0-beta.3",
     "@ionic-internal/docusaurus-plugin-tag-manager": "2.0.0",
-    "@ionic-internal/docusaurus-theme": "3.0.0",
+    "@ionic-internal/docusaurus-theme": "3.0.1",
     "@ionic/prettier-config": "^1.0.1",
     "@ionic/react": "^5.6.8",
     "@mdx-js/react": "^1.6.22",

src/css/custom.scss

@@ -295,3 +295,20 @@ html[data-theme='dark'] .navbar-twitter:before {
   float: right;
   margin: 0 0 1rem 1rem;
 }
+
+.markdown {
+  p,
+  li {
+    font-size: 1rem;
+    line-height: var(--line-height-prose);
+    letter-spacing: var(--letter-spacing-tight);
+  }
+
+  header + p {
+    font-size: 1.25rem;
+
+    + p {
+      font-size: 1.25rem;
+    }
+  }
+}