Move issue/PR templates to docs/

docs/ISSUE_TEMPLATE.md

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++ [ ] I've checked for duplicates of this issue.
++ [ ] `bin/doom clean` and `bin/doom refresh` (then restarting Emacs) did not
+      fix my issue.
++ [ ] I ran `make doctor` and it produced no leads.
++ [ ] My issue cannot be found [in the FAQ](/../../wiki/FAQ)
++ [ ] I filled out the four fields in the template below.
++ [ ] I have deleted this checklist and message.
+
+### Observed behavior
+
+(Describe what happened)
+
+### Expected behavior
+
+(Describe what you expected to happen)
+
+### Steps to reproduce
+
+1. Select these example steps,
+2. Delete them,
+3. And replace them with precise steps to reproduce your issue.
+4. Fill in "system information" below.
+
+### System information
+
+<details>
+<summary>Click to expand</summary>
+
+Replace this line with the output of `M-x doom/info` OR `~/.emacs.d/bin/doom info`
+</details>

docs/PULL_REQUEST_TEMPLATE.md

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+Thank you for contributing to Doom!
+
+Before you submit this PR, please make sure it is targeted at develop, not
+master (unless this is a fix for a critical error). Then replace this message
+with a description of your changes.