Add announcement shortcode and partial (#16210)

Add shortcode, partial, and css so we can display an accouncement
site-wide.
Create a shortcode for use in content/en/ _index.html so
announcement is displayed on website landing page.
Create a partial for use in layouts/docs/baseof.html so
announcement is displaye on every page in '<url>/docs/home'
directory.
Add two values to config.toml: announcement (boolean) for toggling
display of announcement; announcement_message, which is the actual
message.

Signed-off-by: Aimee Ukasick <aimeeu.opensource@gmail.com>

config.toml

@@ -78,6 +78,11 @@ nextUrl = "https://kubernetes-io-vnext-staging.netlify.com/"
 githubWebsiteRepo = "github.com/kubernetes/website"
 githubWebsiteRaw = "raw.githubusercontent.com/kubernetes/website"
 
+# param for displaying an announcement block on every page; see PR #16210
+announcement = false
+# announcement_message is only displayed when announcement = true; update with your specific message
+announcement_message = "The Kubernetes Documentation team would like your feedback!  Please take a <a href='https://www.surveymonkey.com/r/8R237FN' target='_blank'>short survey</a> so we can improve the Kubernetes online documentation."
+
 [[params.versions]]
 fullversion = "v1.15.0"
 version = "v1.15"

content/en/_index.html

@@ -3,6 +3,7 @@ title: "Production-Grade Container Orchestration"
 abstract: "Automated container deployment, scaling, and management"
 cid: home
 ---
+{{< announcement >}}
 
 {{< deprecationwarning >}}
 

layouts/docs/baseof.html

@@ -11,6 +11,7 @@
 			{{ partial "docs/top-menu.html" . }}
 		</section>
 		{{ end }}
+    {{ block "announcement" . }}{{ partial "announcement.html" . }}{{ end }}
 		{{ block "deprecation" . }}{{ partial "deprecation-warning.html" . }}{{ end }}
 		<section id="encyclopedia">
 			{{ block "side-menu" . }}<div id="docsToc" style="display:none;"></div>{{ end }}

layouts/partials/announcement.html

@@ -0,0 +1,11 @@
+{{ if .Param "announcement"}}
+  <section id="announcement">
+    <main>
+      <div class="content announcement">
+        <h3>
+          {{ .Param "announcement_message" | markdownify }}
+        </h3>
+      </div>
+    </main>
+  </section>
+{{ end }}

layouts/shortcodes/announcement.html

@@ -0,0 +1,11 @@
+{{ if .Page.Param "announcement" }}
+<section id="announcement">
+  <main>
+    <div class="content announcement">
+      <h3>
+          {{ .Page.Param "announcement_message" | markdownify }}
+      </h3>
+    </div>
+  </main>
+</section>
+{{ end }}

static/css/announcement.css

@@ -0,0 +1,6 @@
+.announcement {
+    padding: 20px;
+    margin: 20px 0;
+    border-radius: 3px;
+    background-color: #eeeeee;
+}