feat!: add new options with better support for transparency (#185)

This commit adds a few new options and improves transparency support.

Enable transparency styles:

```lua
styles = { transparency = true }
```

Feedback is appreciated!

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -3,24 +3,12 @@ description: Suggest a new feature
 title: "feature: "
 labels: [enhancement]
 body:
-  - type: textarea
-    validations:
-      required: true
-    attributes:
-      label: Is your feature request related to a problem? Please describe.
-      description: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
   - type: textarea
     validations:
       required: true
     attributes:
       label: Describe the solution you'd like
       description: A clear and concise description of what you want to happen.
-  - type: textarea
-    validations:
-      required: true
-    attributes:
-      label: Describe alternatives you've considered
-      description: A clear and concise description of any alternative solutions or features you've considered.
   - type: textarea
     validations:
       required: false