Fix node replacement

Anchors were being calculated incorrectly because it removed the old node before inserting the new one, Now it correctly uses the old node as the anchor for insertion and inserts the new node before removing the old one.

Add detectContentType(extension) function that returns a Content-Type header value with charset for text-based types.

Add mimeTypeToContentType(mimeType) function that converts a MIME type to a Content-Type header value, adding charset for text-based types.

BREAKING CHANGE: Remove BuildRequestHandler type. Use RequestHandler type directly instead.

BREAKING CHANGE: Remove T generic parameter from RequestHandler type. Request handlers always return a Response.

Export the MatchData type from the public API. This type is required when creating custom matchers for use with the router's matcher option.

This is the initial release of the component package.

See the README for more information.