Remove investing information

- Removed "Invest" from unauthenticated home page in Navbar
- Removed button/link from promo area of authenticated home page in
sidebar
- Updated Investors page to remove link leaving two beyind (reports)

app/views/layouts/public.html.haml

@@ -12,7 +12,6 @@
               = image_pack_tag 'gab_logo.svg', alt: 'Gab Social'
             = link_to t('home'), root_url, class: 'nav-link optional'
             = link_to t('about.about_this'), about_path, class: 'nav-link'
-            = link_to 'Invest', 'https://invest.gab.com', class: 'nav-link'
             = link_to 'Apps', 'https://apps.gab.com', class: 'nav-link'
           .nav-center
           .nav-right