Add CSS and docs for remarkup checkbox list styles

Summary: See D8931. Ref T3945. CSS for the checkmark styles.

Test Plan: {F149713}

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T3945

Differential Revision: https://secure.phabricator.com/D8932

resources/celerity/map.php

@@ -7,7 +7,7 @@
 return array(
   'names' =>
   array(
-    'core.pkg.css' => 'cd6367eb',
+    'core.pkg.css' => '94fe8187',
     'core.pkg.js' => '417722ff',
     'darkconsole.pkg.js' => 'ca8671ce',
     'differential.pkg.css' => '8a064eb7',
@@ -106,7 +106,7 @@ return array(
     'rsrc/css/application/tokens/tokens.css' => '5f7bca25',
     'rsrc/css/application/uiexample/example.css' => '528b19de',
     'rsrc/css/core/core.css' => '7dff07c3',
-    'rsrc/css/core/remarkup.css' => '98a7627b',
+    'rsrc/css/core/remarkup.css' => '0ec9ea61',
     'rsrc/css/core/syntax.css' => '3c18c1cb',
     'rsrc/css/core/z-index.css' => '7e4989ed',
     'rsrc/css/diviner/diviner-shared.css' => '38813222',
@@ -713,7 +713,7 @@ return array(
     'phabricator-prefab' => '0326e5d0',
     'phabricator-profile-css' => '33e6f703',
     'phabricator-project-tag-css' => '095c9404',
-    'phabricator-remarkup-css' => '98a7627b',
+    'phabricator-remarkup-css' => '0ec9ea61',
     'phabricator-search-results-css' => 'f240504c',
     'phabricator-settings-css' => 'ea8f5915',
     'phabricator-shaped-request' => 'dfa181a4',

src/docs/user/userguide/remarkup.diviner

@@ -158,6 +158,19 @@ As expected, this produces:
 -- Branch
 --- Twig
 
+You can add checkboxes to items by prefacing them with `[ ]` or `[X]`, like
+this:
+
+```
+  - [X] Preheat oven to 450 degrees.
+  - [ ] Zest 35 lemons.
+```
+
+When rendered, this produces:
+
+  - [X] Preheat oven to 450 degrees.
+  - [ ] Zest 35 lemons.
+
 Make **code blocks** by indenting two spaces:
 
   f(x, y);

webroot/rsrc/css/core/remarkup.css

@@ -71,6 +71,19 @@
   margin: 12px 0 12px 30px;
 }
 
+.phabricator-remarkup .remarkup-list-with-checkmarks {
+  list-style: none;
+  margin-left: 18px;
+}
+
+.phabricator-remarkup .remarkup-list-with-checkmarks input {
+  margin-right: 2px;
+}
+
+.phabricator-remarkup .remarkup-list-with-checkmarks .remarkup-checked-item {
+  color: {$greytext};
+}
+
 .phabricator-remarkup ul ol,
 .phabricator-remarkup ul ul,
 .phabricator-remarkup ol ol,