Convert issue templates to issue forms

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Report any unexpected behavior to help us improve OpenHistoricalMap.
+labels:
+ - bug
+body:
+ - type: textarea
+   id: actual
+   attributes:
+     label: What happened?
+     description: Describe the actual, unexpected behavior. Consider including a screenshot to illustrate the problem.
+ - type: textarea
+   id: expected
+   attributes:
+     label: What should happen?
+     description: Describe the behavior you expected.
+ - type: textarea
+   id: repro-steps
+   attributes:
+     label: Steps to reproduce
+     description: Provide detailed instructions to reproduce the behavior, including the URL of the specific webpage where the problem is present. 
+     placeholder: |
+       1. Go to '...'
+       2. Click on '....'
+       3. Scroll down to '....'
+       4. See error
+ - type: textarea
+   id: environment
+   attributes:
+     label: Environment
+     description: Describe your environment, such as your Web browser, operating system, or whether you’re logged into OpenHistoricalMap. 
+ - type: dropdown
+   id: reproducibility
+   attributes:
+     label: Reproducibility
+     description: How often or easy is it to reproduce this issue?
+     options:
+      - Don’t know
+      - Always
+      - Sometimes
+      - Never
+     default: 0
+ - type: textarea
+   id: additional
+   attributes:
+     label: Additional information
+     description: Mention any existing workaround. If you think you know what causes the issue or how to fix it, explain it here.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: OpenHistoricalMap Forum
+    url: https://forum.openhistoricalmap.org/
+    about: Ask a question or propose a data import.
+  - name: OpenHistoricalMap projects on the OpenStreetMap Wiki
+    url: https://wiki.openstreetmap.org/wiki/OpenHistoricalMap/Projects
+    about: Document a mapping project or a proposed data import.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Bug report
+description: Suggest a new feature for OpenHistoricalMap
+labels:
+ - enhance
+body:
+ - type: textarea
+   id: description
+   attributes:
+     label: Description
+     description: Describe a new feature for OpenHistoricalMap. 
+ - type: textarea
+   id: motivation
+   attributes:
+     label: Motivation
+     description: Describe who would benefit from this feature and how they would benefit.
+ - type: textarea
+   id: workarounds
+   attributes:
+     label: Existing workarounds
+     description: An existing, possibly hacky workaround for accomplishing the same goal.
+ - type: textarea
+   id: additional
+   attributes:
+     label: Additional information
+     description: Any other context, comparables, screenshots, pictures of drawings on napkins about the feature request.

.github/ISSUE_TEMPLATE/style_request.yml

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+name: Map stylesheet request
+description: Request a change to a map style built into openhistoricalmap.org
+labels:
+ - stylesheets
+assignees:
+ - vknoppkewetzel
+body:
+ - type: textarea
+   id: description
+   attributes:
+     label: Description
+     description: Describe what you want to see added or modified in the style. Is it something easy to explain like a color fill or rendering something not currently showing? Or is it a more complex need specific to historical mapping? 
+ - type: textarea
+   id: examples
+   attributes:
+     label: Examples
+     description: Examples of where you expect to see the changes reflected on the map. Include screenshots and full openhistoricalmap.org URLs.
+ - type: textarea
+   id: prior-art
+   attributes:
+     label: Prior art
+     description: If you’re asking for new symbology, especially for historical points of interest or areas that might not be part of modern maps, are there existing cartographic symbols or standards we can reference? The more info you can provide here the better!
+ - type: input
+   id: tag
+   attributes:
+     label: Tag
+     description: A relevant key, tag value, or relation type in the OpenHistoricalMap database. Link to documentation on the OpenStreetMap Wiki if available.   
+     placeholder: key=value
+ - type: textarea
+   id: additional
+   attributes:
+     label: Additional information
+     description: Any other context, such as the relevant property in the vector tile schema.