docs(m1): add my.home-assistant.io badge for ESPHome Device Builder install

[bharvey88]

What does this implement/fix?

The M-1 ESPHome getting started guide tells the user to "click the button below" to install the ESPHome Device Builder add-on, but no button was actually rendered. This adds the official my.home-assistant.io supervisor_addon badge that deep-links straight into the user's Home Assistant supervisor add-on store with the ESPHome Device Builder pre-selected, matching the pattern already used on products/general/setup/switch-to-beta-branch.md and products/general/calibrating-and-updating/updating-firmware.md.

Also capitalized "Start on Boot" to match the actual toggle label in the Home Assistant add-on UI.

Types of changes

• Typo / wording fix
• Content update (correcting outdated info, adding missing steps, clarifications)
• New page or new product section
• Page move / rename (redirect added in mkdocs.yml)
• Image / screenshot update
• Nav / structure change
• Site config or theme change
• CI / workflows / dependencies — Does not publish

Checklist:

• This PR targets the dev branch (not main)
• Changes previewed locally with mkdocs serve
• If pages were moved or renamed, redirects were added to mkdocs.yml
• If new pages were added, nav was updated in mkdocs.yml

Summary by CodeRabbit

• Documentation
  • Updated ESPHome setup guide with clearer installation instructions, including a convenient badge link that directly opens the Home Assistant supervisor add-on store with ESPHome pre-selected for faster setup.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1531a8cd-4f0b-4004-ba6e-83b7ffdc4f12

📥 Commits

Reviewing files that changed from the base of the PR and between 5901a5c and 9523b3f.

📒 Files selected for processing (1)

• docs/products/m1/setup/getting-started-m1-esphome.md

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Walkthrough

The ESPHome getting-started guide for the M1 product was updated to capitalize the "Start" instruction text and include a direct badge link to the Home Assistant supervisor add-on store for simplified ESPHome add-on installation.

Changes

Cohort / File(s)	Summary
ESPHome M1 Setup Documentation docs/products/m1/setup/getting-started-m1-esphome.md	Updated instruction text capitalization ("Start on Boot") and added a badge link for direct access to the Home Assistant supervisor add-on store.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• Fix mkdocs build warnings (ESK-1 nav path, M-1 cross-links) #758: Modifies the same ESPHome getting-started guide file, fixing cross-file link paths alongside instruction updates.
• docs(m1): add ESPHome (hub75-studio) firmware path with content tabs #743: Updates ESPHome onboarding and adoption content in the M1 documentation.
• M-1 ESPHome docs: WizMote section, Media Proxy repo links, advanced admonition #756: Updates the same documentation file with ESPHome Device Builder instructions and badge links.

Poem

🐰 A button bright, a link so clear,
Makes ESPHome setup without fear!
With caps so bold and badges new,
Getting started's easier to do! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/m1-esphome-device-builder-link

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