Delete old "How to support us" page

[KimberleyCook]

No description provided.

[KimberleyCook]

@mroderick Am I right in thinking this page can now be deleted?

[mroderick]

Yes, you're right — this page can be deleted.

Here's what I checked to confirm:

• Route: config/routes.rb already redirects /how-to-support-us → /volunteer
• Split pages: The content was split into /volunteer, /fundraise, and /donate in feat: split how-to-support-us page into separate volunteer, fundraise, and donate pages #2493
• References: No views, controllers, or tests reference the old how-to-support-us.html.haml file
• i18n keys: The pages.how_to_support_us.* keys are still used by the new split pages (volunteer.html.haml, fundraise.html.haml), so those should stay
• Images: The how-to-support-us/ image assets are also still used by the new pages, so those should stay too

The PR correctly removes only the now-unused view file. The route redirect means existing bookmarks/links still work. 👍