meta: improve github templates (#4004)

.github/ISSUE_TEMPLATE.md

@@ -1,7 +1,9 @@
 <!--
-IMPORTANT: Please use the following link to create a new issue:
+🚨 IMPORTANT 🚨
 
-https://cmty.app/nuxt/issues/new?repo=nuxt.js
+Please use the following link to create a new issue:
+
+👉 https://cmty.app/nuxt/issues/new?repo=nuxt.js
 
 If your issue was not created using the app above, it will be closed immediately.
 -->

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,8 +2,8 @@
 
 ## Types of changes
 <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
-- [ ] Bug fix (non-breaking change which fixes an issue)
-- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Bug fix (a non-breaking change which fixes an issue)
+- [ ] New feature (a non-breaking change which adds functionality)
 - [ ] Breaking change (fix or feature that would cause existing functionality to change)
 
 
@@ -13,13 +13,12 @@
 <!--- If it resolves an open issue, please link to the issue here. For example "Resolves: #1337" -->
 
 
-
 ## Checklist:
 <!--- Put an `x` in all the boxes that apply. -->
 <!--- If your change requires a documentation PR, please link it appropriately -->
 <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 - [ ] My change requires a change to the documentation.
 - [ ] I have updated the documentation accordingly. (PR: #)
 - [ ] I have added tests to cover my changes (if not applicable, please state why)
-- [ ] All new and existing tests passed.
+- [ ] All new and existing tests are passing.