Sync dev to main: mkdocs warning fixes

[bharvey88]

Summary

Publishes the mkdocs warning fixes to main:

• ESPHome Starter Kit nav path corrected to products/ESPHome-Starter-Kit/.
• M-1 Getting Started cross-links use .md-relative paths instead of ../-based URLs.

Test plan

• After merge, mkdocs build emits no warnings for the three paths above.
• WLED-MM ↔ ESPHome cross-links on the M-1 setup pages still work.

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