docs(profile): replace star-history-only org page with a real org overview

[Terastar-Paperclip]

Summary

The current org profile is a single embedded star-history chart — a first-time visitor sees no description of what ESPresense is, who it serves, or where to start.

This PR replaces it with a one-screen overview:

• one-paragraph what-it-is (firmware + companion + HA, in plain language)
• who it'''s for (homeowners / HA users / makers)
• the four flagship repos with one-line each (firmware, companion, ESPresense.com, Floorplan-Creator)
• support escalation: GitHub Discussions → Discord → file an issue
• contributing path: firmware CONTRIBUTING + Discord

Notes

• Single file change: profile/README.md.
• All outbound links verified live.
• Wording aimed at a first-time visitor landing on github.com/ESPresense, not at existing power users — happy to revise tone or trim further.
• The previous star-history chart was not preserved here so the page stays one screen; if you want it kept, easiest is a small follow-up PR appending it after the contributing section.

Tracking on Paperclip ESPA-11.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b54c4b7d-37f2-4c4c-a920-e3a1388d22a8

📥 Commits

Reviewing files that changed from the base of the PR and between eec7ace and 4589fbf.

📒 Files selected for processing (1)

• profile/README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Terastar-Paperclip]

@DTTerastar — review requested when you have a minute. This replaces the bare star-history-only org profile with a one-screen overview (what ESPresense is, who it's for, four flagship repos, support path, contributing). Filed via the Terastar-Paperclip PAT, which is pull-only on this repo — could not set you as a formal reviewer through the API, hence the @-mention. Tracking on Paperclip ESPA-11.

[Terastar-Paperclip]

Can we have BOTH?