Let post factory create default category

- since we have factories that ensure a post has a category created, we
  don't need extra code to create a category before the post

backend/test/features/support/steps.js

@@ -13,7 +13,7 @@ function createUser (slug) {
   return Factory.build('user', {
     name: slug,
   }, {
-    password: '1234'
+    password: '1234',
     email: 'example@test.org',
   })
   // await login({ email: 'example@test.org', password: '1234' })

cypress/integration/common/post.js

@@ -109,7 +109,7 @@ Then("I add all required fields", () => {
     .get(".editor .ProseMirror")
     .type('new post content')
     .get(".base-button")
-    .contains("Just for Fun")
+    .contains("Global Peace & Nonviolence")
     .click()
     .get('.ds-flex-item > .ds-form-item .ds-select ')
     .click()

cypress/integration/common/steps.js

@@ -238,17 +238,6 @@ Given("we have the following comments in our database:", table => {
 });
 
 Given("we have the following posts in our database:", table => {
-    cy.factory().build('category', {
-      id: `cat-456`,
-      name: "Just For Fun",
-      slug: `just-for-fun`,
-      icon: "smile"
-    }).then(categoryJson => {
-      return new Cypress.Promise((resolve, _reject) => {
-        return categoryJson.toJson().then(category => resolve(category))
-      })
-    })
-    .then(category => {
       table.hashes().forEach((attributesOrOptions, i) => {
         cy.factory().build("post", {
           ...attributesOrOptions,
@@ -257,10 +246,8 @@ Given("we have the following posts in our database:", table => {
           pinned: Boolean(attributesOrOptions.pinned),
         }, {
           ...attributesOrOptions,
-          categoryIds: category.id
         });
       })
-    })
 })
 
 Then("I see a success message:", message => {