docs: Refine README for improved clarity and updated content

[chmouel]

docs: Refine README for improved clarity and updated content

Refined the project title and overview for conciseness. Clarified
installation instructions by adding a pip install step and separating
prerequisites from quick start. Explained the mapping of command-line
flags to config.toml keys. Enhanced notification section details and
added notes on NixOS integration and the discontinuation of a related
GNOME project. Improved overall formatting and readability.

Signed-off-by: Chmouel Boudjnah chmouel@chmouel.com

[gemini-code-assist]

Summary of Changes

Hello @chmouel, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the user experience and code quality of the nextmeeting CLI tool. It primarily refines how time is displayed, making countdowns more natural and grammatically correct with plural-aware strings. Additionally, it streamlines internal logic for handling time formats and 'no meeting' messages, ensuring better maintainability and compatibility. The accompanying README updates provide clearer documentation for users, reflecting these improvements and making the tool easier to understand and use.

Highlights

• Time Formatting Logic: Refined the time formatting logic to drop redundant int() casts and ensure proper pluralization for 'time-until' strings (e.g., '1 day', '2 days').
• Hour Separator Consistency: Improved consistency by reusing the hour separator constant without nested f-strings.
• No-Meeting Text Centralization: Centralized the formatting of 'no meeting' text for better maintainability and Python 3.9 compatibility.
• README Updates: Updated the README for improved clarity, including a new overview, refined feature descriptions, clearer installation steps, and expanded usage examples.

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[gemini-code-assist]

Code Review

This pull request addresses previous review feedback, primarily focusing on time formatting and code cleanup. The changes are solid improvements, such as removing redundant int() casts, building plural-aware time strings, and centralizing text formatting. These refactorings enhance readability and maintainability. I have one suggestion to further simplify a block of conditional logic for handling the 'no meetings' case, which would make the code even clearer.