Auto merge of #10202 - weihanglo:github-issue-config, r=alexcrichton

Enhance descriptions of issue templates

## Why

To discuss new features with larger scope, I think it's better discuss with the community, not just people in this repo. Hope these changes can guide people to a more proper place for this kind of feature request.

## Screenshots

#### Add two new types of issue template

- Question
- Inspiring Idea

<img width="500" alt="image" src="https://user-images.githubusercontent.com/14314532/146328466-f234c431-e355-4da1-a34a-b7b4c2490599.png">

#### Mention internal forum and zulip to guide user to discuss

<img width="500" alt="image" src="https://user-images.githubusercontent.com/14314532/146328580-4798983a-58d3-4e5e-9006-bf6d1d089c83.png">