Update location and logo for virtual conference

Author: AndrewKvalheim

_config.yml

@@ -38,7 +38,7 @@ exclude:
 custom:
     year:                   2021
     dates:                  November 5th & 6th
-    location:               TBD
+    location:               Virtual
     license:
         content:            <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA</a>
 

_includes/header.html

@@ -8,7 +8,7 @@
   </button>
 
   <a class="" href="/">
-    <img src="/img/logo.svg" id="logo" alt="Logo" width="184" height="200">
+    <img src="/img/seagl-logo-with-headphone-with-mic.svg" id="logo" alt="Logo" width="184" height="200">
   </a>
 
   <div id="main-nav-container" class="collapse navbar-collapse top-nav-collapse">

_welcome.md

@@ -12,7 +12,7 @@ SeaGL's first year was 2013.
 
 ### When & where
 
-{{ site.custom.dates }}, {{ site.custom.year }}
+**{{ site.custom.dates }}, {{ site.custom.year }}**, online
 
 ### Attend