content: fix images on mobile for pkgsite-redesign.article

The "height" attribute is removed from <img> tags so that images will
scale gracefully as the viewport width becomes narrower than the
original image size.

For golang/go#42493

Change-Id: I951a1d82a119f55d22cd564e871203d07a0a5f28
Reviewed-on: https://go-review.googlesource.com/c/blog/+/270804
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/content/pkgsite-redesign.article b/content/pkgsite-redesign.article
index b071d6a..e68a16a 100644
--- a/content/pkgsite-redesign.article
+++ b/content/pkgsite-redesign.article
@@ -25,7 +25,7 @@
 with the goal of making the experience consistently useful and predictable.
 
 <div class="image">
-<img src="pkgsite-redesign/path.png" width="800" height="513" alt="Landing page for cloud.google.com/go/storage" style="border: 1px solid black;">
+<img src="pkgsite-redesign/path.png" width="800" alt="Landing page for cloud.google.com/go/storage" style="border: 1px solid black;">
 </div>
 
 The path page will display the README at that path if there is one.
@@ -42,7 +42,7 @@
 
 
 <div class="image">
-<img src="pkgsite-redesign/nav.png" width="800" height="530" alt="Jump To feature navigating net/http" style="border: 1px solid black;">
+<img src="pkgsite-redesign/nav.png" width="800" alt="Jump To feature navigating net/http" style="border: 1px solid black;">
 </div>
 
 See [Go issue 41587](https://golang.org/issue/41587) for details on changes in the documentation section.
@@ -55,7 +55,7 @@
 See [Go issue 41588](https://golang.org/issue/41588) for details.
 
 <div class="image">
-<img src="pkgsite-redesign/meta.png" width="800" height="145" alt="Header metadata for github.com/russross/blackfriday" style="border: 1px solid black;">
+<img src="pkgsite-redesign/meta.png" width="800" alt="Header metadata for github.com/russross/blackfriday" style="border: 1px solid black;">
 </div>
 
 ## Video Walkthrough