Reworked the WLED ESP Flasher page and added mkdocs content tab support

[bharvey88]

The WLED ESP Flasher page was orphaned: absent from the nav, and its front-matter title duplicated the ESP GUI page ("Installation using ESP GUI") even though it documents a different tool (the flasher from the WLED-wemos-shield project). The Install Binary page actively recommends it for ESP32, so it deserves a sidebar entry.

• Retitle to "Install using WLED ESP Flasher" and register it under Basics > Installation, resolving the title collision.
• Replace the browse-the-GitHub-folder download step with Windows/macOS content tabs that link the zips directly (both verified working).
• Enable pymdownx.tabbed (alternate style), Material's content tabs. This is the first page to use them; other OS- or board-split pages like Install Binary could adopt them later.

Demo:

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Update: added a slugify function to the tabbed config so tab anchors derive from the labels (#windows / #macos) instead of the auto-generated #__tabbed_1_1 ids, which makes shared links to a specific tab readable and stable.

Summary by CodeRabbit

• Documentation
  • Updated installation guidance with clearer, step-by-step instructions for downloading and launching WLED ESP Flasher on Windows and macOS.
  • Renamed the installation page to “Install using WLED ESP Flasher.”
  • Added the installation guide to the documentation navigation.
  • Enabled tabbed content formatting for improved documentation usability.

[coderabbitai]

Walkthrough

The installation documentation now uses the WLED ESP Flasher title, provides platform-specific download instructions, enables tabbed Markdown support, and adds the page to the installation navigation.

Changes

WLED ESP Flasher documentation

Layer / File(s)	Summary
Markdown support and navigation mkdocs.yml	MkDocs enables pymdownx.tabbed with alternate styling and lowercase slugification, and adds the WLED ESP Flasher page under Installation.
WLED ESP Flasher installation guide docs/basics/install-wled-flasher.md	The page title and download step now identify WLED ESP Flasher and provide Windows and macOS download, unzip, and startup instructions.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• wled/WLED-Docs#351: Both PRs update the Installation navigation in mkdocs.yml.

Suggested reviewers: netmindz

Poem

I’m a rabbit with a flasher to share,
Tabs bloom softly in docs everywhere.
Windows hops, macOS too,
Clear steps guide the firmware through.
WLED shines bright—hip-hop, hooray!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the two main changes: the WLED ESP Flasher docs page rework and the MkDocs tab support update.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code

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