Enable Firefox support for atomic-chrome browser integration

[Copilot]

This PR fixes the atomic-chrome configuration to work with both Chrome and Firefox browsers. The previous configuration was incomplete - it only set up hooks but didn't start the websocket server that browser extensions connect to.

Problem

The existing atomic-chrome configuration in init.el was missing the crucial (atomic-chrome-start-server) call, which meant browser extensions couldn't connect to Emacs for text area editing functionality.

Solution

• Added server startup: Added (atomic-chrome-start-server) in the :config section to start the websocket server
• Cross-browser support: The atomic-chrome package (v2.0.0+) already supports both Chrome and Firefox via the GhostText extension - no browser-specific code needed
• Enhanced documentation: Added comprehensive setup instructions to README for both browsers

Changes Made

1. init.el: Added server startup call with explanatory comments
2. README.md: Added "Browser Integration" section with installation links and usage instructions for both Chrome and Firefox

Usage

After this change, users can:

1. Install the GhostText extension in Chrome or Firefox
2. Focus any text area in their browser
3. Click the GhostText icon to open the content in Emacs
4. Edit with real-time bidirectional synchronization
5. Press C-c C-c to finish editing

The same configuration now works seamlessly with both browsers through the unified GhostText extension.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• melpa.org
  • Triggering command: curl -s REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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