fix(deps): update dependency gatsby-plugin-purgecss to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gatsby-plugin-purgecss	^5.0.0 -> ^6.0.0

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Release Notes

anantoghosh/gatsby-plugin-purgecss

v6.0.2

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Bug Fixes

• #​958 make content option overridable (d3fd7bc)

v6.0.1

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Bug Fixes

• Set correct peerDependency on gatsby (c5df7f1)

v6.0.0

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BREAKING CHANGES

• Updated to PurgeCSS 4.
• Changes to options format.

Migration from < v6

1. Remove rejected option. Instead use printSummary: false if you don't want the stats to show.
2. PurgeCSS options are now defined under PurgeCSSOptions
   • Move whitelist to PurgeCSSOptions -> safelist
   • Move content to PurgeCSSOptions -> content
   • Move and update any other Purge
     CSS options used under the same key.
     https://purgecss.com/configuration.html#options

// gatsy-config.js BEFORE
    {
      resolve: `gatsby-plugin-purgecss`,
      options: {
        rejected: true,
        printRejected:true,
        ignore: ['/ignore.css'],
        whitelist: ['mySelector']
      },
    },

// gatsy-config.js AFTER
    {
      resolve: `gatsby-plugin-purgecss`,
      options: {
        printRejected:true,
        ignore: ['/ignore.css'],
        purgeCSSOptions: {
          safelist: ['mySelector']
        },
      },
    },

Bug Fixes

• update tailwind regex (f7602e3)

Features

• Move to typescript
• Update to latest PurgeCSS v4.

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