layout and CSS for the back to manage domains button

src/registrar/assets/sass/_theme/_base.scss

@@ -37,10 +37,6 @@ body {
   @include typeset('sans', 'xl', 2);
   color: color('primary-darker');
 }
- 
-.usa-nav__primary {
-  margin-top: units(1);
-}
 
 .section--outlined {
   background-color: color('white');

src/registrar/assets/sass/_theme/_buttons.scss

@@ -7,6 +7,17 @@ a[href$="todo"]::after {
   content: " [link TBD]";
   font-style: italic;
 }
+
+a.manage_domain_back {
+  // Slight vertical and horizontal alignment fixes
+  position: relative;
+  top: -2px;
+  left: -5px;
+  font-weight: bold;
+  &:visited {
+    color: color('primary');
+  }
+}
   
 a.breadcrumb__back {
   display:flex;

src/registrar/assets/sass/_theme/_nav-primary.scss

@@ -0,0 +1,9 @@
+@use "uswds-core" as *;
+
+.usa-nav__primary {
+    margin-top: units(1);
+}
+
+.usa-logo-group {
+   flex: 1 1 0%; 
+}

src/registrar/assets/sass/_theme/styles.scss

@@ -9,6 +9,7 @@
 /*--------------------------------------------------
 --- Custom Styles ---------------------------------*/
 @forward "base";
+@forward "nav-primary";
 @forward "typography";
 @forward "buttons";
 @forward "forms";

src/registrar/templates/base.html

@@ -144,23 +144,18 @@
   <header class="usa-header usa-header-basic">
     <div class="usa-nav-container">
       <div class="usa-navbar">
-        {% block logo %}
-        <div class="usa-logo" id="extended-logo">
-          <strong class="usa-logo__text" >
-            <a href="{% url 'home' %}"> .gov </a>
-          </strong>    
-        </div>
-
-          <a href="{% url 'home' %}" class="breadcrumb__back">
-            <strong class="display-flex">
+        <div class="usa-logo-group">
+          {% block logo %}
+            <div class="usa-logo display-inline-block" id="extended-logo">
+              <strong class="usa-logo__text" >
+                <a href="{% url 'home' %}"> .gov </a>
+              </strong>    
+            </div>
+          {% endblock %}
+          <a class="margin-left-3 manage_domain_back" href="{% url 'home' %}">
             Manage your domains
-            </strong>
-          </a>  
-
-
-
-
-        {% endblock %}
+          </a>
+        </div>
         <button type="button" class="usa-menu-btn">Menu</button>
       </div>
       {% block usa_nav %}