Add Key Shortcuts section to README.md documenting custom Neovim and tmux shortcuts

[Copilot]

This PR adds a comprehensive "Key Shortcuts" section to the README.md file to help users understand and quickly reference the custom key mappings configured in this Neovim setup.

What's Added

The new section documents:

Leader Key Configuration

• Leader key: Space - Used as prefix for custom mappings

File Navigation Shortcuts

• File explorer: <leader>pv (Space then pv) - Opens the file explorer
• Telescope file search: <ctrl-p> - Fuzzy finder for files
• Telescope live grep: <ctrl-f> - Search text content across files

Window Navigation

• Move left: <ctrl-h> - Navigate to left split
• Move down: <ctrl-j> - Navigate to bottom split
• Move up: <ctrl-k> - Navigate to top split
• Move right: <ctrl-l> - Navigate to right split

Tmux Integration

• Tmux pane navigation: <ctrl-b> + h/j/k/l - Navigate between tmux panes in the same directions

Additional Changes

• Updated the Table of Contents to include the new "Key Shortcuts" section
• Added a note that these mappings are customizable in lua/shadielfares/remap.lua
• Organized the shortcuts into logical subsections for better readability

Benefits

• New users can quickly learn the custom shortcuts without diving into the Lua configuration files
• Existing users have a handy reference for all key mappings
• Clear documentation of both Neovim and tmux integration shortcuts
• Improved overall documentation quality and user experience

The shortcuts documented match the actual key mappings defined in lua/shadielfares/remap.lua, ensuring accuracy and consistency.

This pull request was created as a result of the following prompt from Copilot chat.

Add a "Key Shortcuts" section to README.md documenting custom Neovim and tmux shortcuts.

This section should cover:

• The leader key is set to for custom mappings.
• File explorer shortcut: pv (Space then pv)
• Telescope fuzzy finder shortcuts: for file search, for live grep
• Window navigation in Neovim: <Ctrl-h/j/k/l> for left, down, up, right splits respectively
• Tmux navigation: <Ctrl-b h/j/k/l> for pane navigation in the same directions

Add a note that these mappings are customizable in lua/shadielfares/remap.lua.

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