docs: Add `go install` as a first-class installation method

Bắt đầu trong phần cài đặt của README, nơi hiện đang mô tả Docker và việc xây dựng từ mã nguồn. Thêm lệnh go install được cung cấp và cấu hình MCP client cục bộ như một phương thức chính thức; được xem là hoàn thành khi người đọc có thể cài đặt binary mà không cần clone hoặc sử dụng Docker, đồng thời cấu hình binary để chạy với stdio.

[!Note]
Responses generated with Claude

Problem

The README currently documents Docker/container as the primary installation method, with "Build from source" (go build) as a fallback framed as "If you don't have Docker." There's no mention of go install, which is the standard one-liner for installing Go binaries.

Proposed change

Add go install alongside the container option as a first-class installation method:

go install github.com/github/github-mcp-server/cmd/github-mcp-server@latest

Then configure the MCP client to use the local binary:

{
  "mcpServers": {
    "github": {
      "command": "github-mcp-server",
      "args": ["stdio"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "<YOUR_TOKEN>"
      }
    }
  }
}

Why

• One command, no clone needed — go install fetches, builds, and places the binary in $GOPATH/bin in one step
• Faster startup — no container overhead on each MCP server launch
• No Docker/Podman dependency — many developers have Go installed but not a container runtime
• Lower resource usage — containerized MCP servers consume memory even when idle, limiting the number of IDEs or agent terminals that can run concurrently. A native binary uses no resources when not actively handling a request.
• Safe — the binary only makes outbound HTTP calls to the GitHub API via stdio; container isolation adds no meaningful security benefit here
• Standard Go practice — go install is the idiomatic way to distribute Go CLI tools

Verified

Tested on macOS (darwin/arm64):

$ go install github.com/github/github-mcp-server/cmd/github-mcp-server@latest
go: downloading github.com/github/github-mcp-server v1.0.1
$ github-mcp-server --version
GitHub MCP Server - Version: version