Update headers with new font and color theme

_sass/_layout.scss

@@ -127,7 +127,8 @@ figure.fullwidth {
 
 .post-title {
   --border: 3px dotted var(--brand-color);
-  font-size: 2em;
+  font-family: "Post title font";
+  font-size: 4em;
   color: var(--brand-color);
   border-bottom: var(--border);
   letter-spacing: -1px;
@@ -156,6 +157,9 @@ figure.fullwidth {
   h2,
   h3,
   h4 {
+    font-family: "Post title font";
+    color: rgba(8,76,207,.5);
+
     a {
       opacity: 0;
       transition: opacity 0.15s ease;
@@ -170,6 +174,14 @@ figure.fullwidth {
     }
   }
 
+  h1 {
+    @include relative-font-size(2);
+
+    @include media-query($on-laptop) {
+      @include relative-font-size(1.75);
+    }
+  }
+
   h2 {
     @include relative-font-size(2);
 

_sass/_tags.scss

@@ -8,9 +8,5 @@
     margin-left: 1.25em;
     color: var(--brand-color);
     list-style-type: square;
-
-    li a {
-      color: white;
-    }
   }
 }

_sass/main.scss

@@ -15,10 +15,6 @@
   font-family: "Post title font";
   src: url("/assets/fonts/font-title.woff2");
 }
-@font-face {
-  font-family: "Post subtitle font";
-  src: url("/assets/fonts/font-subtitle.woff2");
-}
 
 $text-color: #4B5361;
 $background-color: #F6F5EF;