Update readme's table of content (lucide-icons#104)

* Update (#2)

update

* Update README.md

* Fix links

* Fix typo

Co-authored-by: Eric Fennis <eric.fennis@gmail.com>

Co-authored-by: Locness <37651007+locness3@users.noreply.github.com>
Co-authored-by: Eric Fennis <eric.fennis@gmail.com>

README.md

@@ -10,9 +10,18 @@ Lucide is a community-run fork of [Feather Icons](https://github.com/feathericon
 
 ## Table of Contents
 
+* [Installation](#installation)
+  * [Package managers](#package-managers)
+  * [CDN](#cdn)
 * [Usage](#usage)
+  * [Unpkg](#with-unpkg)
+  * [ESModules](#with-esmodules)
+    * [Options](#additional-options)
+    * [Threeshake library](#threeshake-the-library-only-use-the-icons-you-use)
+    * [Custom binding](#custom-element-binding)
   * [Figma](#figma)
 * [Contributing](#contributing)
+* [Community](#community)
 * [License](#license)
 
 ## Installation