docs: reformat the documentation

[Revathyvenugopal162]

fix #373 #404
This pull request enhances the documentation for the Ansys Sphinx theme with the following updates:

• User Guide: Updated to include comprehensive information.
• Examples: Added demonstrations of style changes for all applicable extensions.
• Copyright: Ensured proper attribution for examples, particularly from Sphinx Design and Admonitions, which were directly downloaded.
  
  
  
  
  
  
  

[PipKat]

Suggested change

	Linkcode extension
	The ``linkcode`` extension

I can't find any doc that refers to this by anything but the extension/package name. Occurrences of "Linkcode" should be changed to linkcode extension.

[PipKat]

Suggested change

	To use the ``ansys-sphinx-theme`` linkcode extension, you need to add it to the Sphinx configuration:
	#. Add the following line in the ``conf.py`` file:
	To use the ``linkcode`` extension, you must add it to the ``extensions`` variable in your
	project's Sphinx ``conf.py`` file:

You shouldn't have a procedure with only one step. You will need to fix the indentation of the code block.

[PipKat]

Suggested change

	Adapted from the original `linkcode` extension in Sphinx, see
	Adapted from the original ``linkcode`` extension in Sphinx. For more information, see

What is adapted? This sentence needs a sentence and it should have display text for the link (rather than the URL itself).

[Revathyvenugopal162]

changed this to

The ``linkcode`` extension in this version has been adapted from the original 
`Sphinx linkcode extension <https://github.com/sphinx-doc/sphinx/blob/main/sphinx/ext/linkcode.py>`_.
This adaptation involves modifying the original code and functionality from the Sphinx library.

[PipKat]

Suggested change

	The `link_code_library` configuration option can be used to specify a custom library
	for link resolution.
	You can use the ``link_code_library`` configuration option to specify a custom library
	for link resolution.

I'd like to make some edits to the preceding lines but I can't do so in this PR. There are additional places where single backticks are used instead of double backticks. Single backticks render as italics in the doc (rather than as a code entity).

[PipKat]

Lots of suggestions for you.

[Revathyvenugopal162]

Thank you for the detailed review, @PipKat. I have addressed all the comments, I hope you can open a documentation review at your convenience once this PR is merged as mentioned above.