Remove tasks to upgrade to version 1.3.0

These tasks are not needed for new installations, and in existing
installations they've already been executed when upgrading to version
1.3.0.

lib/tasks/db.rake

@@ -4,17 +4,4 @@ namespace :db do
     @avoid_log = args[:print_log] == "avoid_log"
     load(Rails.root.join("db", "dev_seeds.rb"))
   end
-
-  desc "Load SDG content into database"
-  task load_sdg: :environment do
-    ApplicationLogger.new.info "Adding Sustainable Development Goals content"
-    load(Rails.root.join("db", "sdg.rb"))
-    WebSection.where(name: "sdg").first_or_create!
-  end
-
-  desc "Calculates the TSV column for all polls and legislation processes"
-  task calculate_tsv: :environment do
-    Poll.find_each(&:calculate_tsvector)
-    Legislation::Process.find_each(&:calculate_tsvector)
-  end
 end