Add GitBook logo to project templates

changelogs/unreleased/dennis-project-templates-add-gitbook-logo.yml

+---
+title: Add GitBook logo to project templates
+merge_request: 33403
+author:
+type: changed

lib/gitlab/project_template.rb

@@ -49,7 +49,7 @@ module Gitlab
         ProjectTemplate.new('hugo', 'Pages/Hugo', _('Everything you need to create a GitLab Pages site using Hugo.'), 'https://gitlab.com/pages/hugo'),
         ProjectTemplate.new('jekyll', 'Pages/Jekyll', _('Everything you need to create a GitLab Pages site using Jekyll.'), 'https://gitlab.com/pages/jekyll', 'illustrations/logos/jekyll.svg'),
         ProjectTemplate.new('plainhtml', 'Pages/Plain HTML', _('Everything you need to create a GitLab Pages site using plain HTML.'), 'https://gitlab.com/pages/plain-html'),
-        ProjectTemplate.new('gitbook', 'Pages/GitBook', _('Everything you need to create a GitLab Pages site using GitBook.'), 'https://gitlab.com/pages/gitbook'),
+        ProjectTemplate.new('gitbook', 'Pages/GitBook', _('Everything you need to create a GitLab Pages site using GitBook.'), 'https://gitlab.com/pages/gitbook', 'illustrations/logos/gitbook.svg'),
         ProjectTemplate.new('hexo', 'Pages/Hexo', _('Everything you need to create a GitLab Pages site using Hexo.'), 'https://gitlab.com/pages/hexo', 'illustrations/logos/hexo.svg'),
         ProjectTemplate.new('sse_middleman', 'Static Site Editor/Middleman', _('Middleman project with Static Site Editor support'), 'https://gitlab.com/gitlab-org/project-templates/static-site-editor-middleman'),
         ProjectTemplate.new('nfhugo', 'Netlify/Hugo', _('A Hugo site that uses Netlify for CI/CD instead of GitLab, but still with all the other great GitLab features.'), 'https://gitlab.com/pages/nfhugo', 'illustrations/logos/netlify.svg'),