Fixed broken anchors and removed duplicate in index

README.md

@@ -129,8 +129,8 @@ If you want to be a reliability engineer or systems engineer, study more from th
     - [Compilers](#compilers)
     - [Emacs and vi(m)](#emacs-and-vim)
     - [Unix command line tools](#unix-command-line-tools)
-    - [Information theory](#information-theory)
-    - [Parity & Hamming Code](#parity--hamming-code)
+    - [Information theory](#information-theory-videos)
+    - [Parity & Hamming Code](#parity--hamming-code-videos)
     - [Entropy](#entropy)
     - [Cryptography](#cryptography)
     - [Compression](#compression)
@@ -145,7 +145,6 @@ If you want to be a reliability engineer or systems engineer, study more from th
     - [Locality-Sensitive Hashing](#locality-sensitive-hashing)
     - [van Emde Boas Trees](#van-emde-boas-trees)
     - [Augmented Data Structures](#augmented-data-structures)
-    - [N-ary (K-ary, M-ary) trees](#n-ary-k-ary-m-ary-trees)
     - [Balanced search trees](#balanced-search-trees)
         - AVL trees
         - Splay trees
@@ -160,8 +159,8 @@ If you want to be a reliability engineer or systems engineer, study more from th
     - [Disjoint Sets & Union Find](#disjoint-sets--union-find)
     - [Math for Fast Processing](#math-for-fast-processing)
     - [Treap](#treap)
-    - [Linear Programming](#linear-programming)
-    - [Geometry, Convex hull](#geometry-convex-hull)
+    - [Linear Programming](#linear-programming-videos)
+    - [Geometry, Convex hull](#geometry-convex-hull-videos)
     - [Discrete math](#discrete-math)
     - [Machine Learning](#machine-learning)
 - [Additional Detail on Some Subjects](#additional-detail-on-some-subjects)