Doc: Add a Joplin Cloud plan with more available storage to the website

[personalizedrefrigerator]

Summary

This pull request updates the website with a "Pro 100 GB" Joplin Cloud plan.

This pull request is currently a draft: There are supporting backend changes that still need to be merged and/or enabled.

[coderabbitai]

.

[coderabbitai]

⚠️ Potential issue | 🟡 Minor | ⚡ Quick win

Mark the decorative arrow as aria-hidden.

The → is purely decorative; screen readers will announce it as "right arrow" before the action label, which is noisy. Wrap it (or add aria-hidden) so only the action label is announced.

♿ Proposed fix

-					<button type="button" class="action-link action-{{actionId}}">→ <span class="action-label">{{label}}</span></button>
+					<button type="button" class="action-link action-{{actionId}}"><span aria-hidden="true">→ </span><span class="action-label">{{label}}</span></button>

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	<button type="button" class="action-link action-{{actionId}}">→ <span class="action-label">{{label}}</span></button>
	<button type="button" class="action-link action-{{actionId}}"><span aria-hidden="true">→ </span><span class="action-label">{{label}}</span></button>

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@Assets/WebsiteAssets/templates/partials/plan.mustache` at line 31, The
decorative arrow character before the action label is being read by screen
readers; update the button markup for the element with class "action-link" /
"action-{{actionId}}" so the arrow is marked aria-hidden (e.g., wrap the "→" in
a span and add aria-hidden="true" or set aria-hidden on the existing span) and
ensure the visible action label remains in the span with class "action-label" so
only the label is announced.