Remove README Header emojis, simplify sections in preparation for Package Manager Readme Consolidation/Infra

[joshfree]

What does this PR do?

Make the text shorter and simpler. Make it very clear you only need 1 install option. Remove emojis and HTML anchor tags and ampersand symbols to reduce pain for package pipeline infrastructure.

• Simplified Custom Client (renamed to "Other IDEs")
• Simplified install steps for Docker, Nuget, and NPM for consistency with the "Other IDEs" changes.
• Fixed tab/spacing bugs with json and bash snippets
• Removed emojis and HTML anchors
• Removed & from headings as that is not recommended per style-guide

GitHub issue number?

N/A

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
  • Commit history is clean with descriptive messages (cleanup guide)
  • Added comprehensive tests for new/modified functionality
  • Updated servers/Azure.Mcp.Server/CHANGELOG.md and/or servers/Fabric.Mcp.Server/CHANGELOG.md for product changes (features, bug fixes, UI/UX, updated dependencies)
• For MCP tool changes:
  • One tool per PR: This PR adds or modifies only one MCP tool for faster review cycles
  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
  • Updated command list in /docs/azmcp-commands.md and/or /docs/fabric-commands.md
  • For new or modified tool descriptions, ran ToolDescriptionEvaluator and obtained a score of 0.4 or more and a top 3 ranking for all related test prompts
  • For new tools associated with Azure services or publicly available tools/APIs/products, add URL to documentation in the PR description
• Extra steps for Azure MCP Server tool changes:
  • Updated test prompts in /docs/e2eTestPrompts.md
  • 👉 For Community (non-Microsoft team member) PRs:
    • Security review: Reviewed code for security vulnerabilities, malicious code, or suspicious activities before running tests (crypto mining, spam, data exfiltration, etc.)
    • Manual tests run: added comment /azp run mcp - pullrequest - live to run Live Test Pipeline

[Copilot]

Pull Request Overview

This PR improves the installation documentation for the Azure MCP Server by reorganizing and clarifying the installation methods. The changes focus on making it clearer how users can install and configure the Azure MCP Server across different environments.

Key changes include:

• Reorganized installation sections to better distinguish IDEs from package managers
• Added clearer instructions for unsupported IDEs under "Other IDEs" section
• Simplified and standardized installation steps for Docker, NuGet, and NPM