gddo-server/assets/templates: use HTTPS for links

Fixes golang/gddo#496.

Change-Id: I48a7ea476fb40037d32c136e03227b455dee5f10
Reviewed-on: https://go-review.googlesource.com/49651
Reviewed-by: Dmitri Shuralyov <shurcool@gmail.com>
diff --git a/gddo-server/assets/templates/about.html b/gddo-server/assets/templates/about.html
index 96c5283..a991fce 100644
--- a/gddo-server/assets/templates/about.html
+++ b/gddo-server/assets/templates/about.html
@@ -3,11 +3,11 @@
 {{define "Body"}}
 <h1>About</h1>
 
-<p>GoDoc hosts documentation for <a href="http://golang.org/">Go</a>
+<p>GoDoc hosts documentation for <a href="https://golang.org/">Go</a>
 packages on <a href="https://bitbucket.org/">Bitbucket</a>, <a
   href="https://github.com/">GitHub</a>, <a
   href="https://launchpad.net/">Launchpad</a> and <a
-  href="http://code.google.com/hosting/">Google Project Hosting</a>.
+  href="https://code.google.com/hosting/">Google Project Hosting</a>.
 
 <p>The source code for GoDoc is available <a
   href="https://github.com/golang/gddo">on GitHub</a>.
@@ -18,9 +18,9 @@
 <h4 id="howto">Add a package to GoDoc</h4>
 
 <p>GoDoc generates documentation from Go source code. The <a
-  href="http://blog.golang.org/godoc-documenting-go-code">guidelines</a>
+  href="https://blog.golang.org/godoc-documenting-go-code">guidelines</a>
 for writing documentation for the <a
-  href="http://golang.org/cmd/godoc/">godoc</a> tool apply to GoDoc.
+  href="https://golang.org/cmd/godoc/">godoc</a> tool apply to GoDoc.
 
 <p>It's important to write a good summary of the package in the first sentence
 of the package comment. GoDoc indexes the first sentence and displays the first
@@ -33,7 +33,7 @@
 
 <p>GoDoc checks for package updates once per day. You can force GoDoc to update
 the documentation immediately by clicking the refresh link at the bottom of the
-package documentation page. 
+package documentation page.
 
 <p>GoDoc crawls package imports and child directories to find new packages.
 
@@ -51,7 +51,7 @@
 <h4 id="feedback">Feedback</h4>
 
 <p>Send your ideas, feature requests and questions to the <a href="https://groups.google.com/group/golang-dev">golang-dev mailing list</a>.
-Report bugs using the <a href="https://github.com/golang/gddo/issues/new">GitHub Issue Tracker</a>. 
+Report bugs using the <a href="https://github.com/golang/gddo/issues/new">GitHub Issue Tracker</a>.
 
 <h4 id="shortcuts">Keyboard Shortcuts</h4>
 
@@ -63,7 +63,7 @@
 <p>The GoDoc bookmarklet navigates from pages on Bitbucket, GitHub Launchpad
 and Google Project Hosting to the package documentation. To install the
 bookmarklet, click and drag the following link to your bookmark bar: <a
- href="javascript:window.location='http://{{.Host}}/?q='+encodeURIComponent(window.location)">GoDoc</a>
+ href="javascript:window.location='https://{{.Host}}/?q='+encodeURIComponent(window.location)">GoDoc</a>
 
 <h4>More Documentation</h4>