Enable support for Webp in gatsby-remark-images-contentful

[AlbericTrancart]

Summary

As of now, gatsby-remark-contentful-images doesn't have a withWebp option like gatsby-remark-images.

Basic example

This config:

{
  resolve: `gatsby-transformer-remark`,
  options: {
    plugins: [
      {
        resolve: `gatsby-remark-images-contentful`,
        options: {
          maxWidth: 1000,
          withWebp: true
        }
      }
    ]
  }
},

Would add srcsets to webp images with a fallback on the classic srcset for unsupported browsers.

Motivation

This could provide a substantial speed improvement on supported browsers.

I volunteer for coding this feature :)

[sidharthachatterjee]

Hey @AlbericTrancart

It's awesome that you went ahead and wrote this out and opened the PR! Just wanted to leave this comment to say thank you.

[gatsbot]

Hiya!

This issue has gone quiet. Spooky quiet. 👻

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[AlbericTrancart]

Hey! This issue has a PR ready and waiting for approval.

[gatsbot]

Hey again!

It’s been 30 days since anything happened on this issue, so our friendly neighborhood robot (that’s me!) is going to close it.

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