Add Accessibility Properties for SVGs

[martyanovandrey]

Description:
The current implementation of YFM processing supports the addition of accessibility properties like alt text for images. However, there is a need to extend similar support to SVG elements to enhance their accessibility and usability.

Proposed Solution:

1. Extend the YFM processing to recognize and handle accessibility attributes for SVG elements.
2. Update the documentation to reflect these changes and provide examples of how to add these accessibility properties to SVGs.

![icon with a book image](_images/book.svg)

<svg role="img">
   <title>icon with a book image</title>
   ...
</svg>