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

CONTRIBUTING.md

@@ -1,3 +1,4 @@
+<!-- Autogenerated by weave; DO NOT EDIT -->
 # Contributing to the Go MCP SDK
 
 Thank you for your interest in contributing! The Go SDK needs active
@@ -6,11 +7,28 @@ new and emerging use-cases. We welcome all forms of contribution, from filing
 and reviewing issues, to contributing fixes, to proposing and implementing new
 features.
 
-As described in the [design document](./design/design.md), it is important for
+As described in the [design document](https://github.com/modelcontextprotocol/go-sdk/blob/main/design/design.md), it is important for
 the MCP SDK to remain idiomatic, future-proof, and extensible. The process
 described here is intended to ensure that the SDK evolves safely and
 transparently, while adhering to these goals.
 
+1. [Development setup](#development-setup)
+	1. [Conformance tests](#conformance-tests)
+1. [Filing issues](#filing-issues)
+	1. [Bugs](#bugs)
+	1. [Proposals](#proposals)
+	1. [Design discussion](#design-discussion)
+1. [Contributing code](#contributing-code)
+	1. [Adding and updating dependencies](#adding-and-updating-dependencies)
+	1. [Updating the README](#updating-the-readme)
+1. [Timeouts](#timeouts)
+1. [Code of conduct](#code-of-conduct)
+1. [Governance](#governance)
+	1. [Working Group meetings](#working-group-meetings)
+	1. [Discord](#discord)
+	1. [Antitrust considerations](#antitrust-considerations)
+
+
 ## Development setup
 
 This module can be built and tested using the standard Go toolchain. Run `go