Added a max-width to text blocks that are blowing out too wide. Fixes jupyter#431

Author: palewire

_includes/partners.html

@@ -2,7 +2,7 @@
     <div class="row section-header">
         <img src="{{site.baseurl}}/assets/institutional_partners2.svg" class="section-icon img-responsive" alt="institutional partners">
         <h3 class="col-sm-12 section-header">Institutional Partners</h3>
-        <p class="col-sm-12 support-paragraph">
+        <p class="support-paragraph">
             Institutional Partners are organizations that support the project by employing Jupyter Steering Council members.
             Current Institutional Partners include:
         </p>

_includes/sponsors.html

@@ -3,7 +3,7 @@
     <div class="row">
         <img src="{{site.baseurl}}/assets/sponsors2.svg" class="section-icon img-responsive" alt="sponsors">
         <h3 class="col-sm-12 section-header">Sponsors</h3>
-        <p class="col-sm-12 support-paragraph">Project Jupyter receives direct funding from the following sources:</p>
+        <p class="support-paragraph">Project Jupyter receives direct funding from the following sources</p>
     </div>
 
     <div class="row">

css/logo-nav.css

@@ -260,8 +260,9 @@ body {
 .support-paragraph {
     font-size: 15px;
     line-height: 1.5;
-    margin-bottom: 16px;
     text-align: center;
+    max-width: 630px;
+    margin: 0 auto 16px auto;
 }
 
 /* Orange action button */

widgets.html

@@ -30,7 +30,7 @@ <h2>Interactive Widgets</h2>
     <div class="container">
       <img class="section-icon img-responsive" src="assets/widget.svg" alt="icon to represent multiple notebooks">
         <h3 class="col-sm-12 section-header">Notebook Widgets</h3>
-      <p class="support-paragraph">Notebooks come alive when interactive widgets are used. Users can visualize and control changes in the data. Learning becomes an immersive, plus fun, experience. Researchers can easily see how changing inputs to a model impacts the results.</p>
+        <p class="support-paragraph">Notebooks come alive when interactive widgets are used. Users can visualize and control changes in the data. Learning becomes an immersive, plus fun, experience. Researchers can easily see how changing inputs to a model impacts the results.</p>
     </div>
   </div>
 </section>