Update the pricing to note that Enterprise users should pay $50/mo for Gold (#368)

## Summary
- render each pricing detail in its own fitted segment so multi-price
plans reuse the existing single-price spacing

## Testing
- not run (not requested)

------
[Codex
Task](https://chatgpt.com/codex/tasks/task_e_69149fec032883209a3a12de87191b42)

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Author: ericholscher

content/pages/pricing.html

@@ -36,7 +36,7 @@ <h1 class="ui medium header">
 
           {% call pricing.plan(
             name="Advanced plan",
-            price="$150",
+            price_details=[("$150", "per month")],
             color="violet",
             highlight=True,
           ) %}
@@ -54,7 +54,7 @@ <h1 class="ui medium header">
 
           {% call pricing.plan(
             name="Pro plan",
-            price="$250",
+            price_details=[("$250", "per month")],
             color="violet",
           ) %}
             <div class="ui list relaxed divided">
@@ -155,7 +155,10 @@ <h2 class="ui small monospace center aligned header">
 
           {% call pricing.plan(
             name="Gold membership",
-            price="$5",
+            price_details=[
+              ("$5", "per month for individuals"),
+              ("$50", "per month for companies"),
+            ],
             color="teal",
           ) %}
             <div class="ui list relaxed divided">

content/partials/pricing.html

@@ -8,27 +8,32 @@
 {#
   Main plan block for commercial/community plan cards
 #}
-{% macro plan(name, price, color="teal", highlight=False) %}
-  <div class="{% if not price %} computer only {%- endif %} column">
-    <div class="ui {%- if price %} raised {{ color }} {%- else %} basic {%- endif %} segment">
+{% macro plan(name, price_details, color="teal", highlight=False) %}
+  {% set _has_price = price_details | length > 0 %}
+  <div class="{% if not _has_price %} computer only {%- endif %} column">
+    <div class="ui {%- if _has_price %} raised {{ color }} {%- else %} basic {%- endif %} segment">
 
       <h2 class="ui small monospace center aligned header">
         {{ name }}
       </h2>
 
-      {% if price %}
-        <div class="ui horizontally fitted basic small segment">
-          <div class="ui tiny center aligned one statistics">
-            <div class="statistic">
-            <div class="value">
-              {{ price }}
-            </div>
-            <div class="label">
-              <span class="category">per month</span>
-            </div>
+      {% if price_details %}
+        {% for value, label in price_details %}
+          <div class="ui horizontally fitted basic small segment">
+            <div class="ui tiny center aligned one statistics">
+              <div class="statistic">
+                <div class="value">
+                  {{ value }}
+                </div>
+                {% if label %}
+                  <div class="label">
+                    <span class="category">{{ label }}</span>
+                  </div>
+                {% endif %}
+              </div>
             </div>
           </div>
-        </div>
+        {% endfor %}
       {% endif %}
 
       {{ caller() }}