Add documentation backed by mkdocs (#883)

Affects /docs - (Refined Documentation for deployment and added Some
Supporting documentation)
Added a github action for deployment

Fixes #835  

Added Support for mkdocs
Example -  https://dinesht04.github.io/go-sdk/

Requires Configuration of Github pages as follows:-

1. Enable Github Pages
2. Select gh-pages branch for deployment

<img width="1237" height="817" alt="gh-pages"
src="https://github.com/user-attachments/assets/01f0b012-d5f3-4011-9af9-7269e657ae6a"
/>

## Sources
# For mkdocs.yaml
1.
https://github.com/modelcontextprotocol/python-sdk/blob/main/mkdocs.yml
2. https://github.com/modelcontextprotocol/java-sdk/blob/main/mkdocs.yml
  3. MKDocs official documentation
# For Github Action
1.
https://github.com/modelcontextprotocol/python-sdk/blob/main/.github/workflows/publish-docs-manually.yml
2.
https://github.com/modelcontextprotocol/java-sdk/blob/main/.github/workflows/docs.yml
3.
https://github.com/james-willett/material-mkdocs-youtube-2024/blob/main/.github/workflows/ci.yml
- From Youtube Tutorial

docs/server.md

@@ -399,8 +399,8 @@ mcp.AddTool(server, &mcp.Tool{
 }, WeatherTool)
 ```
 
-_See [mcp/tool_example_test.go](../mcp/tool_example_test.go) for the full
-example, or [examples/server/toolschemas](examples/server/toolschemas/main.go)
+_See [mcp/tool_example_test.go](https://github.com/modelcontextprotocol/go-sdk/blob/main/mcp/tool_example_test.go) for the full
+example, or [examples/server/toolschemas](https://github.com/modelcontextprotocol/go-sdk/blob/main/examples/server/toolschemas/main.go)
 for more examples of customizing tool schemas._
 
 **Stateless server deployments:** Some deployments create a new