Add github issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐞 Bug report
+description: Report a bug/issue
+labels: [bug]
+assignees: [wlorenzetti]
+body:
+- type: checkboxes
+  attributes:
+    label: Checklist
+    description: >
+      Please confirm the following:
+    options:
+    - label: I've searched through the existing [issues](https://github.com/g3w-suite/g3w-admin/issues) and this bug has never been reported before
+      required: false
+- type: textarea
+  attributes:
+    label: Subject of the issue
+    description: Describe your issue here.
+    placeholder: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Steps to reproduce
+    description: Steps to reproduce the behavior.
+    placeholder: |
+      1. Go to '...'
+      2. Click on '....'
+      3. Scroll down to '....'
+      4. See error
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Environment
+    description: |
+     Please provide as much information as possible in order to resolve your issue. Need help? [Find out your version](https://github.com/g3w-suite/g3w-admin#version).
+    value: |
+     - g3w-admin: __version__
+     - g3-client: __version__
+     - browser: __name__
+     - operating system: __name and version (desktop or mobile)__
+  validations:
+    required: true
+- type: input
+  attributes:
+    label: Link to your project
+    description: A public URL that can help others to check your issue
+    placeholder: eg. https://dev.g3wsuite.it/en/map/demo-34/
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Additional info
+    description: |
+      Add any other useful information that could allow others to replicate your issue, for example:
+      - **installed plugins**
+      - **project structure**
+      - **configuration files**
+      - **self-explanatory pictures**
+    placeholder: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: ☝️ Feature request
+description: Suggest an idea for this project
+labels: 'feature'
+assignees: [wlorenzetti]
+body:
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: >
+        Please confirm the following:
+      options:
+        - label: I've searched through the [current issues](https://github.com/g3w-suite/g3w-admin/issues) to make sure this feature hasn't been requested already.
+          required: false
+
+  - type: textarea
+    attributes:
+      label: Motivation
+      description: Is your feature request related to a problem? Provide a clear and concise description of what the problem is.
+      placeholder: e.g. "I'm always frustrated when [...]"
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Suggested solution
+      description: Provide a clear and concise description of what you want to happen.
+      placeholder: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Alternatives considered
+      description: Please describe any alternative solutions or features you've considered.
+      placeholder: Screenshots, video, links, etc.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/improve_documentation.yml

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+name: 📄 Improve documentation
+description: Suggest new additions or updates to existing documentation
+labels: 'docs'
+body:
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: >
+        Please confirm the following:
+      options:
+        - label: I've searched through the [current issues](https://github.com/g3w-suite/g3w-admin/issues) to make sure this feature hasn't been requested already.
+          required: false
+
+  - type: input
+    attributes:
+      label: Which documents need updating?
+      description: >
+        For existing content, please provide one or more URLs of documents that need updating.
+        You may also provide [permalinks](https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-a-permanent-link-to-a-code-snippet) to the relevant source code.
+      placeholder: e.g. "https://g3w-suite.readthedocs.io/en/v.3.4.x/g3wsuite_administration.html"
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Motivation
+      description: Why is this change needed? Provide a clear and concise description of what the problem is.
+      placeholder: >
+        e.g. "The documentation doesn't help me understand how to [...]"
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Suggested changes
+      description: Provide a clear and concise description of the changes you want to see.
+      placeholder: You can attach images or log files by clicking this area to highlight it and then dragging files in.
+    validations:
+      required: true