Add favicon/manifest #191

name: Feature request
about: Suggest an idea for this project

Feature request

What is the expected behavior?
Generate different sizes favicons from one source SVG and create a manifest.

What is motivation or use case for adding/changing the behavior?
Don't have to manually create and commit different favicon sizes and include them in helmet. I think most people would want to configure a web app manifest as well.

How should this be implemented in your opinion?
Use gatsby-plugin-manifest.
I gave it a try and it seemed to work fine just by adding it into plugins. I thought there might be some issues with helmet, but seem ok.

This is the configuration I used. I guess the current coffee cup favicon will need to be recreated as an SVG, unless someone knows the source?

  {
      resolve: `gatsby-plugin-manifest`,
      options: {
        name: `Kaldi`,
        short_name: `Kaldi`,
        start_url: `/`,
        background_color: `#FFFFFF`,
        theme_color: `#FFFFFF`,
        icon: `src/img/favicon.svg`, // Need to create this asset
        include_favicon: true,
      },
    },

Are you willing to work on this yourself?
yes