docs: make direct links to guides from description to make list of docs shorter

README.md

 
 eSpeak NG is available as:
 
-*  A command line program (Linux and Windows) to speak text from a file or
+*  A [command line](src/espeak-ng.1.ronn) program (Linux and Windows) to speak text from a file or
    from stdin.
-*  A shared library version for use by other programs. (On Windows this is
+*  A [shared library](docs/integration.md) version for use by other programs. (On Windows this is
    a DLL).
 *  A SAPI5 version for Windows, so it can be used with screen-readers and
    other programs that support the Windows SAPI5 interface.
 
 1. [User guide](docs/guide.md) explains how to set up and use eSpeak NG from command line or as a library.
 2. [Building guide](docs/building.md) provides info how to compile and build eSpeak NG from the source.
-3. [Integration guide](docs/integration.md) provides samples how to use eSpeak NG as a library.
 4. [Index](docs/index.md) provides full list of more detailed information for contributors and developers.
 5. Look at [contribution guide](docs/contributing.md) to start your contribution.
 6. Look at [eSpeak NG roadmap](https://github.com/espeak-ng/espeak-ng/wiki/eSpeak-NG-roadmap) to participate in development of eSpeak NG.