Show clone button on project page for README preference

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/33023

app/views/projects/_readme.html.haml

 - if (readme = @repository.readme) && readme.rich_viewer
+  .tree-holder
+    .nav-block.mt-0
+      = render 'projects/tree/tree_header', tree: @tree
   %article.file-holder.readme-holder{ id: 'readme', class: ("limited-width-container" unless fluid_layout) }
-    .js-file-title.file-title
+    .js-file-title.file-title-flex-parent
+      .file-header-content
         = blob_icon readme.mode, readme.name
         = link_to project_blob_path(@project, tree_join(@ref, readme.path)) do
           %strong

changelogs/unreleased/204904-show-clone-button-on-project-page.yml

+---
+title: Show clone button on project page for readme preference
+merge_request: 33023
+author:
+type: changed