fix skip nav on portfolio pages

src/registrar/templates/no_portfolio_domains.html

@@ -5,6 +5,7 @@
 {% block title %} Domains | {% endblock %}
 
 {% block portfolio_content %}
+<div id="main-content">
     <h1 id="domains-header">Domains</h1>
     <section class="section--outlined">
         <div class="section--outlined__header margin-bottom-3">
@@ -27,4 +28,5 @@
             {% endif %}
         </div>
     </section>
+</div>
 {% endblock %}

src/registrar/templates/portfolio_base.html

@@ -4,7 +4,7 @@
   <div id="wrapper" class="dashboard--portfolio">
       {% block content %}
         
-        <main id="main-content" class="grid-container">
+        <main class="grid-container">
             {% if user.is_authenticated %}
             {# the entire logged in page goes here #}
             

src/registrar/templates/portfolio_domains.html

@@ -5,6 +5,8 @@
 {% block title %} Domains | {% endblock %}
 
 {% block portfolio_content %}
+<div id="main-content">
     <h1 id="domains-header">Domains</h1>
     {% include "includes/domains_table.html" with portfolio=portfolio user_domain_count=user_domain_count %}
+</div>
 {% endblock %}

src/registrar/templates/portfolio_organization.html

@@ -17,7 +17,7 @@
         {% include 'portfolio_organization_sidebar.html' %}
     </div>
 
-    <div class="tablet:grid-col-9">
+    <div class="tablet:grid-col-9" id="main-content">
 
         <h1>Organization</h1>
 

src/registrar/templates/portfolio_requests.html

@@ -5,6 +5,7 @@
 {% block title %} Domain requests | {% endblock %}
 
 {% block portfolio_content %}
+<div id="main-content">
     <h1 id="domain-requests-header">Domain requests</h1>
 
     {% comment %}
@@ -20,4 +21,5 @@
     </p>
     
     {% include "includes/domain_requests_table.html" with portfolio=portfolio %}
+</div>
 {% endblock %}

src/registrar/templates/portfolio_senior_official.html

@@ -17,7 +17,7 @@
         {% include 'portfolio_organization_sidebar.html' %}
     </div>
 
-    <div class="tablet:grid-col-9">
+    <div class="tablet:grid-col-9" id="main-content">
         {% include "includes/senior_official.html" with can_edit=False %}
     </div>
 </div>