Various fixes

[vertism]

Description

• Fixes earlybird to remove navigation
• Remove statsd
• Remove GA events
• Remove legacy code (emails, members controller)

[lucas-shaw]

I had to run rails assets:precompile as i was originally getting an error

ActionView::Template::Error (The asset "application.css" is not present in the asset pipeline.
):

Causes:
Sprockets::Rails::Helper::AssetNotFound (The asset "application.css" is not present in the asset pipeline.
)
    14:     <%= favicon_link_tag asset_path('govuk-frontend/dist/govuk/assets/images/govuk-icon-mask.svg'), rel: 'mask-icon', color: '#0b0c0c' %>
    15:     <%= favicon_link_tag asset_path('govuk-frontend/dist/govuk/assets/images/govuk-icon-180.png'), rel: 'apple-touch-icon', type: 'image/png', size: '180x180' %>
    16:
    17:     <%= stylesheet_link_tag "application", "font-awesome/css/font-awesome" %>
    18:
    19:     <%= javascript_include_tag "application", defer: true %>
    20: