docs: fix ToC in README

README.md

@@ -7,15 +7,15 @@ A web based user interface with controls for the [mpv mediaplayer](https://mpv.i
 
   * [Usage](#usage)
     + [Options](#options)
-      - [port (int)](#port--int-)
-      - [ipv4 (bool)](#ipv4--bool-)
-      - [ipv6 (bool)](#ipv6--bool-)
-      - [disable (bool)](#disable--bool-)
-      - [logging (bool)](#logging--bool-)
-      - [osd_logging (bool)](#osd-logging--bool-)
-      - [audio_devices (string)](#audio-devices--string-)
-      - [static_dir](#static-dir)
-      - [htpasswd_path](#htpasswd-path)
+      - [port (int)](#port-int)
+      - [ipv4 (bool)](#ipv4-bool)
+      - [ipv6 (bool)](#ipv6-bool)
+      - [disable (bool)](#disable-bool)
+      - [logging (bool)](#logging-bool)
+      - [osd_logging (bool)](#osd_logging-bool)
+      - [audio_devices (string)](#audio_devices-string)
+      - [static_dir](#static_dir)
+      - [htpasswd_path](#htpasswd_path)
       - [collections](#collections)
     + [Authentication](#authentication)
   * [Dependencies](#dependencies)