Include manage-folders.php Docs template.

BuddyPress Docs 1.9+ loads the manage-folders template using `bp_locate_template()`,
which doesn't work properly with pre-theme-compat themes like cbox-theme. Until
the problem is fixed in Docs (probably by using `bp_docs_locate_template()`
instead), we work around the issue by providing a copy of manage-folders.php
in cbox-theme.

See #241.

docs/manage-folders.php

@@ -0,0 +1,65 @@
+<?php if ( ! empty( $_GET['delete-folder'] ) ) : ?>
+
+	<h3><?php _e( 'Delete Folder', 'bp-docs' ) ?></h3>
+	<?php $folder_to_delete = get_post( $_GET['delete-folder'] ); ?>
+
+	<?php if ( ! is_a( $folder_to_delete, 'WP_Post' ) || 'bp_docs_folder' !== $folder_to_delete->post_type ) : ?>
+		<p><?php _e( 'This does not appear to be a valid folder.', 'bp-docs' ) ?></p>
+	<?php else : ?>
+		<form action="<?php echo bp_get_requested_url() ?>" method="post">
+
+		<p>
+			<?php printf(
+				__( 'You are about to delete the folder %s.', 'bp-docs' ),
+				sprintf( '<a href="%s">%s</a>', esc_url( bp_docs_get_folder_url( $folder_to_delete->ID ) ), esc_html( $folder_to_delete->post_title ) )
+			) ?>
+		</p>
+
+		<p>
+			<?php _e( '<strong>WARNING:</strong> Deleting a folder will also delete all Docs and subfolders in the folder. This action cannot be undone. To preserve your content, remove everything from this folder before deleting it.', 'bp-docs' ) ?>
+		</p>
+
+		<p>
+			<input type="checkbox" value="1" name="delete-confirm" /> <?php _e( 'I understand the consequences and wish to continue deleting this folder.', 'bp-docs' ) ?>
+		</p>
+
+		<p>
+			<input type="submit" name="bp-docs-delete-folder-submit" class="button-primary" value="<?php _e( 'Delete', 'bp-docs' ) ?>" />
+			<a href="<?php echo remove_query_arg( 'delete-folder', bp_get_requested_url() ) ?>"><?php _e( 'Cancel', 'bp-docs' ) ?></a>
+			<?php wp_nonce_field( 'bp-docs-delete-folder-' . $folder_to_delete->ID ) ?>
+		</p>
+
+		</form>
+	<?php endif ?>
+
+
+<?php else : ?>
+
+<?php $folders = bp_docs_get_folders( array(
+	'display' => 'flat',
+	'parent_id' => null,
+) ); ?>
+<?php $walker = new BP_Docs_Folder_Manage_Walker(); ?>
+
+<?php $f = $walker->walk( $folders, 10, array( 'foo' => 'bar' ) ); ?>
+
+<h3><?php _e( 'Manage Existing Folders', 'bp-docs' ) ?></h3>
+<ul class="docs-folder-manage">
+	<?php echo $f ?>
+</ul>
+
+<hr />
+
+<div class="create-new-folder">
+	<form method="post" action="">
+		<h3><?php _e( 'Create New Folder', 'bp-docs' ) ?></h3>
+		<?php bp_docs_create_new_folder_markup( array(
+			'folder_type_include_all_groups' => true,
+		) ) ?>
+
+		<?php wp_nonce_field( 'bp-docs-create-folder', 'bp-docs-create-folder-nonce' ) ?>
+		<input type="submit" name="bp-docs-create-folder-submit" value="<?php _e( 'Create', 'bp-docs' ) ?>" />
+	</form>
+</div>
+
+<?php endif ?>