[Endgame] Prep v1.9 branch for 1.10 release

[hhunter-ms]

Signed-off-by: Hannah Hunter hannahhunter@microsoft.com

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Description

• Add v1.10 (latest) to nav bar
• Archive notice
• Update root README.md
• Update URL in config.toml
• Delete workflow file

Issue reference

PR will close: #3074