[skip ci] Add issue forms (#705)

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: ⚠️ Application issue
+    url: https://github.com/tachiyomiorg/tachiyomi/issues/new/choose
+    about: Issues and requests about the app itself should be opened in the tachiyomi repository instead
+  - name: ⚠️ Extension/source issue
+    url: https://github.com/tachiyomiorg/tachiyomi-extensions/issues/new/choose
+    about: Issues and requests for extensions and sources should be opened in the tachiyomi-extensions repository instead
+  - name: 📦 Tachiyomi extensions
+    url: https://github.com/tachiyomiorg/tachiyomi-extensions
+    about: List of all available extensions with download links
+  - name: 🖥️ Tachiyomi website
+    url: https://tachiyomi.org/help/
+    about: Guides, troubleshooting, and answers to common questions

.github/ISSUE_TEMPLATE/report_issue.yml

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+name: 🐞 Issue report
+description: Report an issue with tachiyomi.org
+labels: [Bug]
+body:
+
+  - type: checkboxes
+    id: acknowledgements
+    attributes:
+      label: Acknowledgements
+      description: Read this carefully, we will close and ignore your issue if you skimmed through this.
+      options:
+        - label: I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open issue.
+          required: true
+        - label: I have written a short but informative title.
+          required: true
+        - label: I will fill out all of the requested information in this form.
+          required: true
+
+  - type: textarea
+    id: reproduce-steps
+    attributes:
+      label: Steps to reproduce
+      description: Provide an example of the issue.
+      placeholder: |
+        Example:
+          1. First step
+          2. Second step
+          3. Issue here
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: Explain what you should expect to happen.
+      placeholder: |
+        Example:
+          "This should happen..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: actual-behavior
+    attributes:
+      label: Actual behavior
+      description: Explain what actually happens.
+      placeholder: |
+        Example: 
+          "This happened instead..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: other-details
+    attributes:
+      label: Other details
+      placeholder: |
+        Additional details and attachments.

.github/ISSUE_TEMPLATE/request_feature.yml

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+name: ⭐ Feature request
+description: Suggest a feature to improve tachiyomi.org
+labels: [Feature request]
+body:
+
+  - type: checkboxes
+    id: acknowledgements
+    attributes:
+      label: Acknowledgements
+      description: Read this carefully, we will close and ignore your issue if you skimmed through this.
+      options:
+        - label: I have searched the existing issues and this is a new ticket, **NOT** a duplicate or related to another open issue.
+          required: true
+        - label: I have written a short but informative title.
+          required: true
+        - label: I will fill out all of the requested information in this form.
+          required: true
+
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: Describe your suggested feature
+      description: How can the website be improved?
+      placeholder: |
+        Example:
+          "It should work like this..."
+    validations:
+      required: true
+
+  - type: textarea
+    id: other-details
+    attributes:
+      label: Other details
+      placeholder: |
+        Additional details and attachments.