chore: rewrite issue templates

.github/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,27 @@
+---
+name: 🐛 Bug report
+labels: "bug"
+about: Create a report to help us improve
+---
+
+## 🐛 Bug Report
+
+A clear and concise description of what the bug is.
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Link to repro (highly encouraged)
+
+Please provide either a [CodeSandbox demo](https://codesandbox.io/s/82zqr6n3kj) or a minimal repository on GitHub.
+
+## Environment
+
+-   **Immer version:**
+-   [ ] Occurs with `setUseProxies(true)`
+-   [ ] Occurs with `setUseProxies(false)` (ES5 only)

.github/ISSUE_TEMPLATE/feature.md

@@ -0,0 +1,17 @@
+---
+name: 🚀 Feature Proposal
+labels: "proposal"
+about: Submit a proposal for a new feature
+---
+
+## 🚀 Feature Proposal
+
+A clear and concise description of what the feature is.
+
+## Motivation
+
+Please outline the motivation for the proposal.
+
+## Example
+
+Please provide an example for how this feature would be used.