Update issue templates

.github/ISSUE_TEMPLATE/new-generator-idea.md

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+---
+name: New Generator Idea
+about: Use this template if you have an idea for a new generator.
+title: ''
+labels: New generator, hacktoberfest
+assignees: ''
+
+---
+
+**Example Problem:**
+
+**Example Solution:**
+
+**Further explanation:**
+
+**Would you like to be assigned to this:**