[DOCS] All styles should be in seperate file

[sagarpandyansit]

Problem:
All styles are in the HTML file itself. It is not a good practice to write a style in an HTML file. There should be a separate file for all styles and link that style to your HTML file would be a better option.

Solution:
Make a separate stylesheet file for all styles and link that to the HTML file.

[sagarpandyansit]

Please label it as SWoC and assign it to me.