Add modern github issue templates: bug, feature request (#901)

Co-authored-by: Ronan Jouchet <ronan@jouchet.fr>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+
+---
+
+Help us help you, please take the time to fill this information 🙂.
+An incomprehensible bug report is a useless bug report.
+Incomprehensible / incomplete bug reports will be closed.
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Steps to reproduce**
+Give the ***full*** nativefier command you ran, with the ***`--verbose` flag***, on a ***public*** site:
+1. Run `nativefier --verbose ...`
+2. ...
+
+**Expected behavior**
+What you expected to happen.
+
+**Actual behavior**
+What happened instead.
+
+**Logs & screenshots**
+Verbose logs and/or screenshots
+
+**Context**
+ - Nativefier: (for example: 7.7.1)
+ - Node.js: (for example: 13.10.1)
+ - Npm: (for example: 6.14.7)
+ - OS: (for example: Windows 10 build 1809)
+ - Additional specificities: (for example: "I'm behind a proxy, with configuration X and protocol Y")

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for Nativefier
+labels: feature request
+
+---
+
+Help us help you, please take the time to fill this information 🙂.
+An incomprehensible feature request is a useless feature request.
+Incomprehensible / incomplete feature request will be closed.
+
+**Current state and problem statement**
+A clear and concise description of what the problem is. For example: I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of alternative solutions or workarounds you've considered.
+
+**Context**
+ - Nativefier: (for example: 7.7.1)
+ - Node.js: (for example: 13.10.1)
+ - Npm: (for example: 6.14.7)
+ - OS: (for example: Windows 10 build 1809)
+ - Additional specificities: (for example: "I'm behind a proxy, with configuration X and protocol Y")