docs: add table of contents to README

README.md

@@ -6,6 +6,36 @@ A full-screen terminal news ticker that renders live global headlines in large O
 
 ---
 
+## Contents
+
+- [Using](#using)
+  - [Run](#run)
+  - [Config](#config)
+  - [Feeds](#feeds)
+  - [Fonts](#fonts)
+  - [Color Schemes](#color-schemes)
+  - [ntfy.sh](#ntfysh)
+  - [Figment Mode](#figment-mode)
+- [Internals](#internals)
+  - [How it works](#how-it-works)
+  - [Architecture](#architecture)
+- [Extending](#extending)
+  - [NtfyPoller](#ntfypoller)
+  - [MicMonitor](#micmonitor)
+  - [Render pipeline](#render-pipeline)
+- [Development](#development)
+  - [Setup](#setup)
+  - [Tasks](#tasks)
+  - [Testing](#testing)
+  - [Linting](#linting)
+- [Roadmap](#roadmap)
+  - [Performance](#performance)
+  - [Graphics](#graphics)
+  - [Cyberpunk Vibes](#cyberpunk-vibes)
+  - [Extensibility](#extensibility)
+
+---
+
 ## Using
 
 ### Run