Remove unused dependency gatsby-plugin-remove-trailing-slashes

[shrmnk]

Brief description of the changes

From the package docs: https://www.gatsbyjs.com/plugins/gatsby-plugin-remove-trailing-slashes/

Please Note: This plugin will soon be deprecated, please use Gatsby’s trailingSlash option. Read the documentation to learn more.

trailingSlash is already configured in gatsby-config.js (supported since [email protected]) and hence this plugin was not actually configured.

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

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Lighthouse	1 paths audited Performance: 93 (🔴 down 3 from production) Accessibility: 86 (no change from production) Best Practices: 100 (no change from production) SEO: 82 (no change from production) PWA: 70 (no change from production) View the detailed breakdown and full score reports

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