Simplify ISSUE_TEMPLATE

[clintonlunn]

Simplify the bug report and issue template

Feature request should be the following:

**What would you like to be able to do? Please describe.**
A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

**How important is this to you** (Please pick one)
- Not important
- Nice-to-have
- Important
- Critical

Bug report should be the following:

## Steps to Reproduce
<!--- Provide a link to the page or an unambiguous set of steps to -->
<!--- reproduce this bug. Include screen shots if they help. -->
1.
2.
3.

## Screenshots

## Expected Behavior
<!--- Tell us what should happen -->

## Current Behavior
<!--- Tell us what happens instead of the expected behavior -->

## Browser & version
<---  Example: Firefox 102.7.0esr  -->

## Operating system
<--- Example:  MacOS 13.2.1 -->