combined two canvas pages (#365)

Updated layout
Removed Videos
Updated Screenshots
Add copy button for url's

Combined:
LTI version 1.3 
LTI 1.3 for Canvas

---------

Co-authored-by: Lola Valente <lvalente@codio.com>
Co-authored-by: Sharon Sharon <sjason@codio.com>
Co-authored-by: shajason <59740283+shajason@users.noreply.github.com>
Co-authored-by: jairovelasquez <jairo@codio.com>

Author: 3 people

source/_static/css/codio.css

@@ -225,3 +225,7 @@
 .bd-content a.reference {
   font-weight: 600;
 }
+.small-text {
+    font-size: 0.85em;
+}
+.tiny { font-size: 0.75em; }

source/common/develop/websecuritybrowsercapabilities.rst

@@ -195,7 +195,7 @@ Connectivity Test
 If you continue to experience difficulties, visit the `Connection Diagnostics <https://codio.com/connectivity/index.html>`_ page and send us back the generated output.
 
 
-Steps for  sending us the generated output:
+Steps for sending us the generated output:
 
 
 1. Go to your Codio dashboard.