[README] Add table of contents (Closes #4458)

README.md

@@ -1,7 +1,15 @@
 youtube-dl - download videos from youtube.com or other video platforms
 
-# SYNOPSIS
-**youtube-dl** [OPTIONS] URL [URL...]
+- [INSTALLATION](#installation)
+- [DESCRIPTION](#description)
+- [OPTIONS](#options)
+- [CONFIGURATION](#configuration)
+- [OUTPUT TEMPLATE](#output-template)
+- [VIDEO SELECTION](#video-selection)
+- [FAQ](#faq)
+- [DEVELOPER INSTRUCTIONS](#developer-instructions)
+- [BUGS](#bugs)
+- [COPYRIGHT](#copyright)
 
 # INSTALLATION
 
@@ -34,6 +42,8 @@ # DESCRIPTION
 your Unix box, on Windows or on Mac OS X. It is released to the public domain,
 which means you can modify it, redistribute it or use it however you like.
 
+    youtube-dl [OPTIONS] URL [URL...]
+
 # OPTIONS
     -h, --help                       print this help text and exit
     --version                        print program version and exit

devscripts/prepare_manpage.py

@@ -11,8 +11,19 @@
 with io.open(README_FILE, encoding='utf-8') as f:
     readme = f.read()
 
-PREFIX = '%YOUTUBE-DL(1)\n\n# NAME\n'
-readme = re.sub(r'(?s)# INSTALLATION.*?(?=# DESCRIPTION)', '', readme)
+PREFIX = '''%YOUTUBE-DL(1)
+
+# NAME
+
+youtube\-dl \- download videos from youtube.com or other video platforms
+
+# SYNOPSIS
+
+**youtube-dl** \[OPTIONS\] URL [URL...]
+
+'''
+readme = re.sub(r'(?s)^.*?(?=# DESCRIPTION)', '', readme)
+readme = re.sub(r'\s+youtube-dl \[OPTIONS\] URL \[URL\.\.\.\]', '', readme)
 readme = PREFIX + readme
 
 if sys.version_info < (3, 0):