Add form config for Feature Request issues

.github/ISSUE_TEMPLATE/Feature_Request.md

@@ -1,19 +0,0 @@
----
-name: Feature request
-about: Do you find shlink is missing some important feature that would make it more useful?
-labels: feature
----
-
-<!--
-Before opening an issue, just take into account that this is a completely free of charge and open source project.
-I'm always happy to help and provide support, but some understanding will be expected.
-I do this in my own free time, so expect some delays when implementing new features and fixing bugs, and don't take it personal if an issue gets eventually closed.
-You may also be asked to provide tests or ways to reproduce reported bugs.
-Try to be polite, and understand it is impossible for an OSS project to cover all use cases.
-
-With that said, please fill in the information requested next. More information might be requested once the issue is open.
--->
-
-#### Summary
-
-<!-- Describe the new feature you would like to request. -->

.github/ISSUE_TEMPLATE/Feature_Request.yml

@@ -0,0 +1,16 @@
+name: Feature request
+description: Do you find shlink-web-client is missing some important feature that would make it more useful?
+labels: ['feature']
+body:
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Summary
+      value: '<!-- Describe the new feature you would like to request. -->'
+  - type: textarea
+    validations:
+      required: true
+    attributes:
+      label: Use case
+      value: '<!-- Explain why do you think this feature would be useful, and what problems would it help to solve. -->'