Add static sitemap pages

This can be DRYed up thus:
```ruby
  controller :sitemap, defaults: { format: 'xml' } do
    get '/sitemap', action: 'show'
    get '/basic-sitemap', action: 'basic'
    get '/tools-calculators-sitemap', action: 'tools_calculators'
    get '/articles-sitemap', action: 'articles'
    get '/category-sitemap', action: 'category'
    get '/action-plans-sitemap', action: 'action_plans'
    get '/video-sitemap', action: 'video'
    get '/static-sitemap', action: 'static'
    get '/news-sitemap', action: 'news'
    get '/cy-sitemap', action: 'cy'
  end
```