Add github-handle for Greg Pawin in lucky-parking.md

### Prerequisite
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### Overview
We need to create a single variable `github-handle` to hold the github handle for each member of the leadership team. Eventually `github-handle` will replace the `github` and `picture` variables, reducing redundancy in the project file.

### Action Items
- [ ] Open the file `_projects/lucky-parking.md` in the IDE
- [ ] Replace:
```
- name: Greg Pawin
```
with
```
- name: Greg Pawin
github-handle:
```
- [ ] Do not use a tab to indent `github-handle`. YAML doesn't allow tabs; it requires spaces.
- [ ] Using docker, confirm that the appearance of the project webpage is unchanged at all screen sizes. The project webpage URL can be found below under Resources.

### For Merge Team
- [ ] Release the dependency for this issue in #5441. If all the dependencies have been completed, close that issue.

### Resources/Instructions
https://github.com/hackforla/website/wiki/project.md-file-template
https://jekyllrb.com/
For QA to validate change: https://github.com/hackforla/website/blob/gh-pages/_projects/lucky-parking.md?plain=1
Project Webpage: https://www.hackforla.org/projects/lucky-parking

- This issue is part of #5441.
- This issue initiated by #7158