jless: add page

[nil957]

Adds a tldr page for jless, a command-line JSON viewer with vim-inspired keybindings.

Closes #21116

About jless

jless is an interactive JSON/YAML viewer designed for reading, exploring, and searching through JSON data from the command line. It features:

• Vim-inspired navigation and keybindings
• Support for both JSON and YAML files
• Interactive expand/collapse of nested structures
• Full-text search with regex support
• Copy functionality (values, keys, paths)
• Syntax highlighting

Examples included

• View a JSON file interactively
• Read JSON from stdin
• View a YAML file
• Toggle expand/collapse nodes
• Search forward for a pattern
• Copy path to current node
• Copy value of current node
• Display help

More information: https://jless.io

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