Add instance-info CMS content

This allows instance owners to provice some instance-specific information on
the main landing page.

README.md

@@ -129,6 +129,7 @@ The following keys are used in the project:
 - `tos`: Terms of Service
 - `privacy`: Data privacy policy
 - `imprint`: Imprint
+- `instance-info`: Information about the instance, displayed on the landing page
 
 ## Cleanup task
 

app/controllers/home_controller.rb

@@ -1,4 +1,10 @@
 class HomeController < ApplicationController
   def index
+    content = Content.for('instance-info', I18n.locale)
+    unless content.nil?
+      markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML, extensions = {})
+      @instance_info_text = markdown.render(content.content)
+      @instance_info_title = content.title
+    end
   end
 end

app/views/home/index.html.haml

@@ -62,3 +62,9 @@
         privacy_policy: link_to(t('privacy_policy'), privacy_path),
         github_project: link_to('GitHub', 'https://github.com/HopHubProject')).each do |text|
         %p= text.html_safe
+
+  -if @instance_info_text.present?
+    .col-12.col-lg-9
+      .shadow.p-3.mb-5.bg-body.rounded
+        %h1= @instance_info_title
+        = @instance_info_text.html_safe

test/controllers/home_controller_test.rb

@@ -5,6 +5,10 @@ class HomeControllerTest < ActionDispatch::IntegrationTest
     define_method("test_should_get_index_#{locale}") do
       get root_url, params: { locale: locale }
       assert_response :success
+
+      c = Content.for('instance-info', locale)
+      assert_match c.content, @response.body
+      assert_match c.title, @response.body
     end
 
     define_method("test_should_get_imprint_#{locale}") do

test/fixtures/contents.yml

@@ -35,3 +35,10 @@ privacy_en:
   locale: en
   fallback: true
   content: Privacy EN
+
+instance_info_en:
+  name: instance-info
+  title: Instance Info
+  locale: en
+  fallback: true
+  content: Instance Info EN