Migrate docs from Sphinx to MkDocs (#18145)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

docs/community/sponsors.md

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+# Sponsors
+
+vLLM is a community project. Our compute resources for development and testing are supported by the following organizations. Thank you for your support!
+
+<!-- Note: Please sort them in alphabetical order. -->
+<!-- Note: Please keep these consistent with README.md. -->
+
+Cash Donations:
+
+- a16z
+- Dropbox
+- Sequoia Capital
+- Skywork AI
+- ZhenFund
+
+Compute Resources:
+
+- AMD
+- Anyscale
+- AWS
+- Crusoe Cloud
+- Databricks
+- DeepInfra
+- Google Cloud
+- Intel
+- Lambda Lab
+- Nebius
+- Novita AI
+- NVIDIA
+- Replicate
+- Roblox
+- RunPod
+- Trainy
+- UC Berkeley
+- UC San Diego
+
+Slack Sponsor: Anyscale
+
+We also have an official fundraising venue through [OpenCollective](https://opencollective.com/vllm). We plan to use the fund to support the development, maintenance, and adoption of vLLM.