Update github templates to match main repository

.github/ISSUE_TEMPLATE.md

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+Before writing your issue, check our instructions for [reporting bugs](https://github.com/caskroom/#reporting-bugs) or [making requests](https://github.com/caskroom/homebrew-cask#requests), as appropriate. Those will walk you through the process.
+
+If none of those is appropriate, then **delete all this pre-inserted template text** and tell us your issue in as much detail as possible.
+
+Please note that if it is apparent you ignored the instructions for reporting issues, your issue may be closed without review. When the guide isn‘t followed we get the same issues over and over. Having to repeatedly deal with the same solved and documented problems leads to maintainer burnout and a lot of wasted hours that could instead have been spent improving Homebrew-Cask itself and fixing real bugs.
+
+If the guide itself was unclear, open *first* an issue or pull request stating what you found was confusing *and only then* your other issue.
+
+Thank you for taking the time to make a correct report.

.github/PULL_REQUEST_TEMPLATE.md

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+### Instructions
+
+Delete the parts of this template that are not relevant (including these `Instructions`) and fill out the rest.  
+If there’s a checkbox you can’t complete for any reason, that’s OK. Just explain in detail why you weren’t able to do so.  
+*Note:* `{{cask_file}}` represents the cask file you’re submitting/editing.
+
+### Checklist
+
+- [ ] The commit message includes the cask’s name and version.
+- [ ] `brew cask audit --download {{cask_file}}` is error-free.
+- [ ] `brew cask style --fix {{cask_file}}` left no offenses.
+
+Additionally, when **adding a new cask**:
+
+- [ ] Checked there are no open [pull requests](https://github.com/caskroom//pulls) for the same cask.
+- [ ] Checked there are no closed [issues](https://github.com/caskroom//issues) where that cask was already refused.
+- [ ] When naming the cask, followed the [token reference](https://github.com/caskroom//blob/master/doc/cask_language_reference/token_reference.md).
+- [ ] `brew cask install {{cask_file}}` worked successfully.
+- [ ] `brew cask uninstall {{cask_file}}` worked successfully.