Add a configurable alert to convey shutdown info (#1078)

Add the ability to display a bootstrap 5 alert to convey shutdown
information to users. The alert visibility and message are controlled
via the config file.

home/README.md

@@ -13,7 +13,8 @@ First, you'll need a settings file like so in `MATS/home`:
     "config": {
         "is_met_express": false,
         "is_production": false,
-        "environment_label": "Development"
+        "environment_label": "Development",
+        "alert_message": "Lorem ipsum dolor shutdown amet..."
     },
     "groups": [
     {

home/main.go

@@ -15,6 +15,7 @@ type ConfigJSON struct {
 		IsMETexpress     bool   `json:"is_met_express"`
 		IsProduction     bool   `json:"is_production"`
 		EnvironmentLabel string `json:"environment_label"`
+		AlertMessage     string `json:"alert_message"`
 	} `json:"config"`
 	Groups []struct {
 		Name string `json:"name"`

home/templates/alert.html

@@ -0,0 +1,9 @@
+<!-- Mostly used to convey government shutdowns -->
+
+<div class="container-fluid p-3" style="background-color: #dddddd">
+  <div class="alert alert-danger" role="alert">
+    <!-- <p>{{ .Config.AlertMessage }}</p> -->
+    <!-- When congress hands out shutdown lemons, sometimes you need to make shutdown lemonade :-) -->
+    <marquee>{{ .Config.AlertMessage }}</marquee>
+  </div>
+</div>

home/templates/index.html

@@ -13,6 +13,10 @@
     <div id="main" class="container-fluid">
       {{ template "navbar.html" . }}
 
+      {{ if .Config.AlertMessage }}
+        {{ template "alert.html" . }}
+      {{ end }}
+
       {{ if .Config.IsMETexpress }}
       {{ else }}
         {{ template "toggles.html" . }}