feat(AM335X): Add webserver demo user guide

[jeevantelukula]

Add the documentation for the new Webserver Demo added showcasing the audio analytics and performance stats.

[cshilwant]

Some warnings from vales could also be looked into

[github-actions]

New warnings found with rstcheck:

source/linux/Demo_User_Guides/Webserver_Demo_User_Guide.rst:112: (ERROR/3) (bash) syntax error near unexpected token `newline'
source/linux/Demo_User_Guides/Webserver_Demo_User_Guide.rst:112: (ERROR/3) (bash) `    filesink buffer-mode=2 location=<fifo_path>'

[cshilwant]

#542 (comment) needs to be addressed

[cshilwant]

Thanks for handling the suggestions. The v2 is in much better shape.
There are couple of minor fixes needed, post which the PR is good to go

[jeevantelukula]

Updated the PR according to the review comments

[StaticRocket]

I'm mostly fine with this. The image sizes, while being rather large are still under the current mean size. I just fear that the scaled versions will still be hard to see considering the amount of dead space. Feel free to update this if you agree.

[jeevantelukula]

I'm mostly fine with this. The image sizes, while being rather large are still under the current mean size. I just fear that the scaled versions will still be hard to see considering the amount of dead space. Feel free to update this if you agree.

@StaticRocket I wanted to show the complete view of the webpage. However, I have reduced the size of the images by around 50 percent, keeping the view same.