Template file support & full static web generation

This is a minor feature, now we can set diferrents templates from config.js . HTML code of the template has been remove from the index.php

Finally you can build the full static web documentation, new command line options from index.php:
```bash
php index.php generate
```
or one file static documentation:
```bash
php index.php full-doc
```

The code now is refactorized using functions.php for recursive page documentation generation.