[github] update issue template for bug reports

.github/ISSUE_TEMPLATE/bug_report.md

+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Questions**
+
+- Is this a bug concerning building of ink! smart contracts?
+    - If **yes** then you might instead want to file a bug report to ink!'s build tool: https://github.com/paritytech/cargo-contract
+- Is this a bug that appears when interacting with smart contracts via the Polkadot JS browser UI?
+    - If **yes** then you might instead want to file a bug report to the Polkadot JS Apps project instead: https://github.com/polkadot-js/apps
+
+**FAQ**
+
+- Are you using the nightly Rust channel to compile your smart contract?
+- Are you using an up-to-date `cargo-contract`? Check via `cargo contract --version`.
+    - If you are unsure please tell us your version noted there.
+- Are you using an up-to-date ink! version in your smart contract?
+    - You can check this by looking into the `[dependencies]` section of your `Cargo.toml`.
+    - If you are unsure please tell us your version noted there.
+
+**Describe the bug**
+A clear and concise description of what the bug or odd behavior is.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.