Add issue templates (#372)

* Create bug_report.yml

* Create config.yml

* Create feature request template

* Update Matrix room link

.github/bug_report.yml

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+name: Bug report
+description: Create a bug report to help us improve
+labels: [bug]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for helping to make the NewPipe website better by reporting a bug. :hugs:
+
+        Please fill in as much information as possible about your bug so that we don't have to play "information ping-pong" and can help you immediately.
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: "Checklist"
+      options:
+        - label: "I am aware that this issue is being opened for the NewPipe website, NOT the [app](https://github.com/TeamNewPipe/NewPipe) or the [extractor](https://github.com/TeamNewPipe/NewPipeExtractor), and my bug report will be dismissed otherwise."
+          required: true
+        - label: "I made sure that there are *no existing issues* - [open](https://github.com/TeamNewPipe/website/issues) or [closed](https://github.com/TeamNewPipe/website/issues?q=is%3Aissue+is%3Aclosed) - which I could contribute my information to."
+          required: true
+        - label: "I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise."
+          required: true
+        - label: "This issue contains only one bug."
+          required: true
+
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps to reproduce the bug
+      description: |
+        What did you do for the bug to show up?
+
+        If you can't cause the bug to show up again reliably (and hence don't have a proper set of steps to give us), please still try to give as many details as possible on how you think you encountered the bug.
+      placeholder: |
+        1. Go to '...'
+        2. Press on '....'
+        3. Swipe down to '....'
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: |
+        Tell us what you expect to happen.
+
+  - type: textarea
+    id: actual-behavior
+    attributes:
+      label: Actual behavior
+      description: |
+        Tell us what happens with the steps given above.
+
+  - type: textarea
+    id: screen-media
+    attributes:
+      label: Screenshots/Screen recordings
+      description: |
+        A picture or video is worth a thousand words.
+
+        If applicable, add screenshots or a screen recording to help explain your problem.
+        GitHub supports uploading them directly in the text box.
+        If your file is too big for Github to accept, try to compress it (ZIP-file) or feel free to paste a link to an image/video hoster here instead.
+
+  - type: input
+    id: device-os-browser-info
+    attributes:
+     label: Affected OS and browser, along with version
+     description: |
+      With what operating system and browser (+ version for each) did you encounter the bug?
+     placeholder: "Example: Windows 11 / Firefox 128"
+
+  - type: textarea
+    id: additional-information
+    attributes:
+      label: Additional information
+      description: |
+        Any other information you'd like to include, for instance that 
+        * the affected device is foldable or a TV
+        * you have disabled all animations on your device
+        * your cat disabled your network connection
+        * ...

.github/config.yml

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+blank_issues_enabled: false
+contact_links:
+    about: Ask about anything NewPipe-related
+  - name: 💬 Matrix
+    url: https://matrix.to/#/#newpipe:matrix.newpipe-ev.de
+    about: Chat with us via Matrix for quick Q/A
+  - name: 💬 IRC
+    url: https://web.libera.chat/#newpipe
+    about: Chat with us via IRC for quick Q/A

.github/enhancement.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels: [enhancement]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for helping to make the NewPipe website better by suggesting a feature. :hugs:
+
+        Your ideas are highly welcome! The website is made for you, the users, after all.
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: "Checklist"
+      options:
+        - label: "I am aware that this issue is being opened for the NewPipe website, NOT the [app](https://github.com/TeamNewPipe/NewPipe) or the [extractor](https://github.com/TeamNewPipe/NewPipeExtractor), and my feature request will be dismissed otherwise."
+          required: true
+        - label: "I made sure that there are *no existing issues* - [open](https://github.com/TeamNewPipe/website/issues) or [closed](https://github.com/TeamNewPipe/website/issues?q=is%3Aissue+is%3Aclosed) - which I could contribute my information to."
+          required: true
+        - label: "I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise."
+          required: true
+        - label: "This issue contains only one feature request."
+          required: true
+
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: Feature description
+      description: |
+        Explain how you want the website's look or behavior to change to suit your needs.
+    validations:
+      required: true
+
+  - type: textarea
+    id: why-is-the-feature-requested
+    attributes:
+      label: Why do you want this feature?
+      description: |
+        Describe any problem or limitation you come across while using the website which would be solved by this feature.
+    validations:
+      required: true
+
+  - type: textarea
+    id: additional-information
+    attributes:
+      label: Additional information
+      description: Any other information you'd like to include, for instance sketches, mockups, pictures of cats, etc.