Updates per Geeta's request

Moving model conversion instructions further up in the README to draw attention to it.

Adding files that will be used by the GitHub Action for Spell and Link checks.

Will add the Github workflow once these files get added.

Fixing some minor typos and spelling errors which should not affect functionality but improve the overall quality of documentation.

link in table of contents doesn't work without this change or changing the link fragment to `#single-gpu-`