Update issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: I have a problem with the app ❌
+description: Create a report to help us improve Sniffnet.
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: |
+        Please, search [the existing issues] and see if an issue already exists for the bug you encountered.
+
+        [the existing issues]: https://github.com/GyulyVGC/sniffnet/issues
+      options:
+        - label: I have searched the existing issues.
+          required: true
+  - type: textarea
+    attributes:
+      label: What's the problem?
+      id: what-happened
+      description: |
+        What problem are you having? Please, also provide the steps to reproduce it.
+    validations:
+      required: true
+  - type: dropdown
+    id: version
+    attributes:
+      label: How did you install the app?
+      description: |
+        Select the strategy you used to install Sniffnet.
+      options:
+        - downloaded one of the provided packages
+        - installed from crates.io
+        - built locally by cloning the repository
+    validations:
+      required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      description: Select the operating system you are using.
+      options:
+        - Windows
+        - macOS
+        - Linux
+        - FreeBSD
+        - OpenBSD
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional context
+      id: additional-info
+      description: |
+        Do you have any additional information to report? You can optionally include pictures or other resources.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: I want to support the project 💖
+    url: https://github.com/sponsors/GyulyVGC
+    about: Become an official sponsor.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: I have a suggestion 💡
+description: Suggest an idea for Sniffnet (you can request for new features, or other kinds of improvement).
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this report!
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: |
+        Please, search [the existing issues] and see if an issue already exists for your request.
+
+        [the existing issues]: https://github.com/GyulyVGC/sniffnet/issues
+      options:
+        - label: I have searched the existing issues.
+          required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      id: solution
+      description: |
+        Please, describe what you would like to happen.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem?
+      id: is-problem
+      description: |
+        A clear and concise description of what the problem is, if any. Example: I'm always frustrated when [...]
+    validations:
+      required: false