add support for align=left and align=right on block image

Author: mojavelinux

preview-src/index.adoc

@@ -295,7 +295,7 @@ image::multirepo-ssg.svg[Multirepo SSG,3000,opts=interactive]
 Make the switch today!
 
 .Full Circle with Jake Blauvelt
-video::300817511[vimeo,600,300]
+video::300817511[vimeo,640,360,align=left]
 
 [#english+中文]
 == English + 中文

src/css/doc.css

@@ -513,6 +513,16 @@
   align-items: center;
 }
 
+.doc .imageblock.text-left,
+.doc .videoblock.text-left {
+  align-items: flex-start;
+}
+
+.doc .imageblock.text-right,
+.doc .videoblock.text-right {
+  align-items: flex-end;
+}
+
 .doc .imageblock img,
 .doc .imageblock object,
 .doc .imageblock svg,