Mention Discord on README

[benvinegar]

No description provided.

[greptile-apps]

Greptile Summary

This PR adds a Discord community invite link to the project README, positioned just below the main tagline with a horizontal rule separator for visual clarity.

• Adds 💬 _Join us on the Modem Discord: https://discord.gg/MKkTFvQ4_ after the project headline
• Adds a --- separator to cleanly divide the community link from the main project description
• No code logic, tests, or configuration files were changed

Confidence Score: 5/5

• This PR is safe to merge — it is a documentation-only change with no code impact.
• The change is limited to adding two lines of markdown (a community Discord link and a horizontal rule) to the README. There is no risk to functionality, security, or correctness.
• No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a Discord community invite link and horizontal rule separator near the top of the README, after the main project tagline.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[New User visits README] --> B[Reads project tagline]
    B --> C[Sees Discord invite link]
    C --> D[Joins Modem Discord community]
    B --> E[Continues reading project documentation]

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_{Last reviewed commit: ce8ff95}