refactor: migrate images and assets to /blog subdirectory

src/blog_assets/css/print.scss

@@ -0,0 +1,52 @@
+nav,
+.right-side,
+.main-header,
+.main-footer,
+.post-nav,
+.post-list-footer {
+  display: none;
+}
+
+main {
+  padding: 0;
+}
+
+p {
+  orphans: 3;
+  widows: 3;
+  font-size: 12px;
+}
+
+h1, h2, h3, h4 {
+  page-break-after:avoid;
+  break-after: avoid;
+}
+
+h1 {
+  font-size: 22px;
+}
+h2 {
+  font-size: 18px;
+}
+h3 {
+  font-size: 16px;
+}
+h4 {
+  font-size: 14px;
+}
+.main-content {
+  margin: 0;
+  width: 100%;
+}
+.main-content .sub-title {
+  margin: 0.5rem 0 1rem 0;
+}
+.post-list {
+  display: block;
+  gap: 0;
+}
+.post-list-item {
+  max-width: none;
+  box-shadow: none;
+  padding: 0;
+}