jekyll: Do not use strict mode (RobotLocomotion#14672)

Use `contains` for explicit nested config check for one missing var See: Shopify/liquid#1034 (comment)
EricCousineau-TRI · Mar 16, 2021 · 1785319 · 1785319
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commit 1785319
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Showing 2 changed files with 5 additions and 4 deletions.
diff --git a/doc/_config.yml b/doc/_config.yml
@@ -100,6 +100,7 @@ kramdown:
   show_warnings: true
 
 liquid:
-  error_mode: strict
-  strict_variables: true
-  strict_filters: true
+  # TODO(eric.cousineau): Make these stricter at some point.
+  error_mode: warn
+  strict_variables: false
+  strict_filters: false
diff --git a/doc/_includes/header.html b/doc/_includes/header.html
@@ -12,7 +12,7 @@
         <li class="site-menu-item">
           {% if item.url %}<a href="{{ item.url | relative_url }}" class="site-menu-item">{% endif %}{{ item.title }}{% if item.url %}</a>{% endif %}
 
-          {% if item.subfolderitems[0] %}
+          {% if item contains "subfolderitems" %}
             <div class="sub">
             {% for entry in item.subfolderitems %}
               <a href="{{ entry.url | relative_url }}" class="site-menu-item">{{ entry.page }}</a>