remove default text of the Issue templates (#252)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,48 +7,3 @@ assignees: ''
 
 ---
 
-**Describe the bug**
-
-A clear and concise description of what the bug is.
-
-**Expected behavior**
-
-A clear and concise description of what you expected to happen.
-
-**Minimal Reproducible Example**
-
-Without MRE, we would only be able to help you to a limited extent, and attention to the issue would be limited. to know more about MRE refer to [wikipedia](https://en.wikipedia.org/wiki/Minimal_reproducible_example) and [stackoverflow](https://stackoverflow.com/help/minimal-reproducible-example).
-
-```julia
-
-```
-
-**Error & Stacktrace**
-
-```julia
-
-```
-
-**Environment (please complete the following information):**
-
-  - Output of `using Pkg; Pkg.status()`
-
-```julia
-
-```
-
-  - Output of `using Pkg; Pkg.status(; mode = PKGMODE_MANIFEST)`
-
-```julia
-
-```
-
-  - Output of `versioninfo()`
-
-```julia
-
-```
-
-**Additional context**
-
-Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -6,19 +6,3 @@ labels: enhancement
 assignees: ''
 
 ---
-
-**Is your feature request related to a problem? Please describe.**
-
-A clear and concise description of what the problem is. Ex. I’m always frustrated when […]
-
-**Describe the solution you’d like**
-
-A clear and concise description of what you want to happen.
-
-**Describe alternatives you’ve considered**
-
-A clear and concise description of any alternative solutions or features you’ve considered.
-
-**Additional context**
-
-Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -6,5 +6,3 @@ labels: question
 assignees: ''
 
 ---
-
-**Question**