Add page modified time

Gemfile

@@ -9,5 +9,6 @@ group :jekyll_plugins do
     gem 'jekyll-redirect-from'
     gem 'jekyll_flexible_include'
     gem "kramdown-syntax-coderay", "~> 1.0"
+    gem "jekyll-last-modified-at"
 end
 

_config.yml

@@ -33,6 +33,7 @@ plugins:
   - jekyll-redirect-from
   - flexible_include
   - kramdown-syntax-coderay
+  - jekyll-last-modified-at
 
 
 feed:

_includes/footer.html

@@ -1,7 +1,9 @@
 <footer>
-    <a href="https://github.com/TomHodson/tomhodson.github.com/blob/main/{{page.path}}?plain=1">
+    <p><a href="https://github.com/TomHodson/tomhodson.github.com/blob/main/{{page.path}}?plain=1">
         Page Source</a>
          | 
         <a href="/credits">
         Credits</a>
+        |
+        <span>Last Modified {{ page.last_modified_at | date: '%e %b %Y' }}</span>
 </footer>

_sass/footer.scss

@@ -1,4 +1,3 @@
-
 // Padding to keep the keep the content to the right of the header
 footer {
   max-width: 560px;
@@ -14,13 +13,10 @@ footer {
   a {
     text-decoration: none;
   }
-
 }
 
-@media 
+@media only screen and (max-width: $horizontal_breakpoint),
-    only screen and (max-width: $horizontal_breakpoint),
+  only screen and (max-height: $vertical_breakpoint) {
-    only screen and (max-height: $vertical_breakpoint)
-    {  
   footer {
     padding-top: 10px;
     padding-left: 20px;