Move spinach public snippet feature to rspec spec

- Add rspec feature for public snippets
- Remove spinach test for public snippets

features/snippets/public_snippets.feature

-Feature: Public snippets
-  Scenario: Unauthenticated user should see public snippets
-    Given There is public "Personal snippet one" snippet
-    And I visit snippet page "Personal snippet one"
-    Then I should see snippet "Personal snippet one"
-
-  Scenario: Unauthenticated user should see raw public snippets
-    Given There is public "Personal snippet one" snippet
-    And I visit snippet raw page "Personal snippet one"
-    Then I should see raw snippet "Personal snippet one"

features/steps/snippets/public_snippets.rb

-class Spinach::Features::PublicSnippets < Spinach::FeatureSteps
-  include SharedAuthentication
-  include SharedPaths
-  include SharedSnippet
-
-  step 'I should see snippet "Personal snippet one"' do
-    expect(page).to have_no_xpath("//i[@class='public-snippet']")
-  end
-
-  step 'I should see raw snippet "Personal snippet one"' do
-    expect(page).to have_text(snippet.content)
-  end
-
-  step 'I visit snippet page "Personal snippet one"' do
-    visit snippet_path(snippet)
-  end
-
-  step 'I visit snippet raw page "Personal snippet one"' do
-    visit raw_snippet_path(snippet)
-  end
-
-  def snippet
-    @snippet ||= PersonalSnippet.find_by!(title: "Personal snippet one")
-  end
-end

spec/features/snippets/public_snippets_spec.rb

+require 'rails_helper'
+
+feature 'Public Snippets', feature: true do
+  scenario 'Unauthenticated user should see public snippets' do
+    public_snippet = create(:personal_snippet, :public)
+
+    visit snippet_path(public_snippet)
+
+    expect(page).to have_content(public_snippet.content)
+  end
+
+  scenario 'Unauthenticated user should see raw public snippets' do
+    public_snippet = create(:personal_snippet, :public)
+
+    visit raw_snippet_path(public_snippet)
+
+    expect(page).to have_content(public_snippet.content)
+  end
+end