[Polish] Add support for head method and badge

[sserrata]

Description

Adds handler for head HTTP method and appropriate colored badge.

function colorForMethod(method: string) {
  switch (method.toLowerCase()) {
    case "get":
      return "primary";
    case "post":
      return "success";
    case "delete":
      return "danger";
    case "put":
      return "info";
    case "patch":
      return "warning";
    case "head":
      return "secondary";
    default:
      return undefined;
  }
}

Motivation and Context

Consistency and readability.

How Has This Been Tested?

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[github-actions]

Size Change: +47 B (0%)

Total Size: 2.72 MB

Filename	Size	Change
demo/build/assets/js/4c5e977b.********.js	31.3 kB	+42 B (0%)

ℹ️ View Unchanged

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demo/.docusaurus/globalData.json	10.2 kB	0 B
demo/build/assets/css/styles.********.css	84.3 kB	+5 B (0%)
demo/build/assets/js/01a85c17.********.js	2.72 kB	0 B
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demo/build/assets/js/runtime~main.********.js	7.96 kB	0 B
demo/build/index.html	74.8 kB	0 B

_{compressed-size-action}

[github-actions]

Visit the preview URL for this PR (updated for commit 1ca5f37):

https://docusaurus-openapi-36b86--pr105-mhl6dsm9.web.app

_{(expires Thu, 23 Jun 2022 22:25:29 GMT)}

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