Fixed css/main.css route

[mikalai-s]

Motivation

When using docusaurus-start a server treats any request that ends with main.css as one to serve css/main.css. That could break some custom assets in static dir that also have main.css name.

Have you read the Contributing Guidelines on pull requests?

Yes.

Test Plan

1. css/main.css is served:
   • run docusarus-start
   • ensured a home page loads css/main.css
2. css/main.css and custom main.css are served:
   • added api/main.css to static dir
   • updated siteConfig.js with separateCss: ["static/api"]
   • run docusarus-start
   • ensured both css/main.css and api/main.css are served

Related PRs

None.

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[endiliey]

Lgtm.