Update issue templates (#172)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Found a bug? Tell us and help us improve
+title: ''
+labels: a:bug
+assignees: ''
+
+---
+
+**Can the issue be reproduced with the latest available release? (y/n)**
+
+**Which one is the environment gotify server is running in?**
+- [ ] Docker
+- [ ] Linux machine
+- [ ] Windows machine
+<details><summary>Docker startup command or config file here (please mask sensitive information)</summary><br>
+
+```
+
+```
+</details>
+
+**Do you have an reverse proxy installed in front of gotify server? (Please select None if the problem can be reproduced without the presense of a reverse proxy)**
+- [ ] None
+- [ ] Nginx
+- [ ] Apache
+- [ ] Caddy
+<details><summary>Reverse proxy configuration (please mask sensitive information)</summary><br>
+
+```
+
+```
+</details>
+
+**On which client do you experience problems? (Select as many as you can see)**
+- [ ] WebUI
+- [ ] gotify-cli
+- [ ] Android Client <!-- (Please open the issue in gotify/android instead if it is only related to the android client) -->
+- [ ] 3rd-party API call (Please include your code)
+
+
+**What did you do?**
+
+**What did you expect to see?**
+
+**What did you see instead? (Include screenshots, android logcat/request dumps if possible)**

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: a:feature
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. 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 any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/questions.md

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+---
+name: Questions
+about: Having difficulties with gotify? Feel free to ask here
+title: ''
+labels: question
+assignees: ''
+
+---
+
+<!-- 
+Alternative ways to get help:
+Official documentation - https://gotify.net/
+Community chat - https://matrix.to/#/#gotify:matrix.org
+-->
+
+**Have you read the documentation?**
+- [ ] Yes, but it does not include related information regarding my question.
+- [ ] Yes, but the steps described in the documentation do not work on my machine.
+- [ ] Yes, but I am having difficulty understanding it and wants clarification.
+
+**You are setting up gotify in**
+- [ ] Docker
+- [ ] Linux native platform
+- [ ] Windows native platform
+
+
+**Describe your problem**
+<!-- EXAMPLE
+I'm having difficulties setting up my apache reverse proxy
+....
+my config is ...
+-->
+
+
+
+**Any errors, logs, or other information that might help us identify your problem**
+
+Ex: `docker-compose.yml`, `nginx.conf`, android logcat, browser requests, etc.
+
+<details><summary>Name of the information here</summary><br><pre>
+
+contents here
+
+</pre></details>