Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report of an issue so I can know to fix it
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the problem is, and in what circumstances it occurs. What device/client. etc.
+
+**To Reproduce**
+Include the exact contents of your "Custom CSS" field.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/unthemed-element.md

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+---
+name: Unthemed element
+about: Reporting an unthemed part of UI
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe what and where does not get themed by Ultrachromic**
+A clear on concise description.
+
+**Screenshots**
+They really help.