Add github-handle for Mark Jackson in public-tree-map.md

[mugdhchauhan]

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/public-tree-map.md in the IDE
• Replace:

- name: Mark Jackson

with

- name: Mark Jackson
  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 Epic: Create issues to add github-handle to leadership teams #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/public-tree-map.md?plain=1
Project Webpage: https://www.hackforla.org/projects/public-tree-map

• This issue is part of Epic: Create issues to add github-handle to leadership teams #5441.
• This issue is initiated by Create Issues to add new variable github-handle for members in public-tree-map.md #7163.