Add image urls

_posts/2020-01-22-how-the-spn-compares-to-vpns.md

@@ -2,6 +2,8 @@
 title: How the SPN compares to VPNs
 date: 2020-01-22
 author: davegson
+custom_thumbnail_name: how-the-spn-compares-to-vpns
+cover_image_source: https://pixabay.com/vectors/the-globe-globe-the-internet-free-4790044/
 ---
 
 ## Introduction into VPN Technology

_posts/2020-02-04-the-two-steps-it-takes.md

@@ -2,6 +2,8 @@
 title: The Two Steps it Takes
 date: 2020-02-04
 author: davegson
+custom_thumbnail_name: the-two-steps-t-takes
+cover_image_source: https://unsplash.com/photos/7_kRuX1hSXM
 ---
 
 There's no such thing as an overnight success. Successful companies do not suddenly appear, we [just notice them suddenly](https://seths.blog/2014/01/gradually-and-then-suddenly/).

_posts/2020-06-26-progress-update.md

@@ -2,6 +2,7 @@
 title: "Progress Update - #01"
 date: 2020-06-26
 author: davegson
+custom_thumbnail_name: progress-update
 ---
 
 *Note: not every update needs to be [a podcast]({{ site.podcast_url }}) or [a video]({{ site.video_url }}), thought I'd mix things up with a written update - [let me know]({{ site.reddit_url }}) if you like this.*