This pull request addresses several spelling errors and inconsistencies
in the capitalization of proper nouns within the documentation.
### Motivation and Context
To improve the quality of the documentation, spelling errors and
capitalization mistakes have been corrected. This ensures that the
content is more accurate and easier to read.
### Description
Re-work C# code samples with OrtValue API.
Bring `C# Tutorial: Basic` to index.
The site is currently published
[here](https://yuslepukhin.github.io/onnxruntime)
### Motivation and Context
Direct all future usage to `Ortvalue` API
