Issue board details sidebar

Chrome extension for GitLab to enhance its functionality. Currently this includes the addition of an "issue details" sidebar that appears when an item within a project board is clicked. Now updated to work with GitLab v14+ For using the GitLab Details Sidebar on a custom domain for GitLab: * Navigate to your custom GitLab instance * Right click on the extension icon * Select "Enable GitLab Details Sidebar on this domain" * Accept the permissions dialog * Click "Ok" to reload the page