Refactor sidebar logic + Add Table of Contents in reading page (#33)

* Refactor sidebar logic + fix responsiveness

* Add TOC

* Add Pagination

* Update exampleSite

* Update README.md

static/assets/css/sections/recent-posts.css

@@ -0,0 +1,82 @@
+.recent-posts-section .container {
+  padding-top: 1rem;
+}
+
+.recent-posts-section .card .card-footer span {
+  font-size: 10pt;
+  color: #6c757d !important;
+  padding-top: 5px;
+}
+
+.recent-posts-section .card .card-footer {
+  background: #fff;
+  margin-top: auto;
+}
+
+.recent-posts-section .post-card-link {
+  text-decoration: none;
+}
+
+.post-summary {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  display: -webkit-box;
+  /* line-height: 24px;     fallback */
+  max-height: 144px; /* fallback */
+  -webkit-line-clamp: 5; /* number of lines to show */
+  -webkit-box-orient: vertical;
+}
+
+/* ============= Device specific fixes ======= */
+
+/* Large screens such as TV */
+@media only screen and (min-width: 1824px) {
+}
+
+/* Extra large devices (large desktops, 1200px and up) */
+
+@media (max-width: 1400px) {
+}
+
+@media (max-width: 1200px) {
+}
+
+/* IPad Pro */
+@media (max-width: 1024px) {
+}
+
+/*  Large devices (desktops, 992px and up) */
+
+@media (max-width: 992px) {
+}
+
+/* Medium devices (tablets, 768px and up) */
+
+@media only screen and (max-width: 768px) {
+  .recent-posts-section .container {
+    max-width: 100%;
+  }
+  .recent-posts-section .post-card {
+    width: 50%;
+  }
+}
+
+/* Small devices (landscape phones, 576px and up) */
+
+@media only screen and (max-width: 576px) {
+  .recent-posts-section .post-card {
+    width: 100%;
+  }
+}
+
+/* iPhoneX, iPhone 6,7,8 */
+@media only screen and (max-width: 375px) {
+}
+
+/* Galaxy S5, Moto G4 */
+@media only screen and (max-width: 360px) {
+}
+
+/* iPhone 5 or before */
+@media only screen and (max-width: 320px) {
+}