Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: A problem encountered using clangd
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please describe the problem.
+For hints on what information is helpful, see: https://clangd.github.io/troubleshooting.html
+
+If you can, provide a minimal chunk of code that shows the problem (either inline, or attach it if larger).
+
+**Logs**
+Please attach the clangd stderr log if you can. (Usually available from the editor)
+If possible, run with `--log=verbose` - note that the logs will include the contents of open files!
+If this is a crash, try to put `llvm-symbolizer` on your PATH per the troubleshooting instructions.
+
+**System information**
+Output of `clangd --version`:
+Editor/LSP plugin:
+Operating system:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for clangd
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+