feat: adds palatino font family for English inside posts (#87)

* [PUBLISHER] upload files #85

* PUSH NOTE : 01. Security Introduction.md

* PUSH ATTACHMENT : is-01-cryptosystem.png

* [PUBLISHER] upload files #86

* PUSH NOTE : 01. Security Introduction.md

* PUSH ATTACHMENT : is-01-cryptosystem.png

* feat: font style to palatino

assets/css/jekyll-theme-chirpy.scss

@@ -6,10 +6,6 @@
 
 /* append your custom style below */
 
-footer p:last-child::before {
-    content: none;
-}
-
 body, h1, h2, h3, h4, h5, h6 {
     font-family: Pretendard;
 }
@@ -19,6 +15,11 @@ div.highlight {
 }
 
 div.content {
+    h1, h2, h3, h4, h5, h6 {
+        font-family: palatino, Pretendard;
+    }
+
+    font-family: palatino, Pretendard;
     font-size: 110%;
 }