Update index.json text only

Initial updates to the existing copy on the index page. More changes are forthcoming to the text.

Description

Changes are to the text part of the index page. Updating the copy to reflect better grammar, edits to avoid repetition in language, and general tightening of copy.

Related Issue

Motivation and Context

Assigned to the task by Jerome.

How Has This Been Tested?

N/A - change only to text. No other updates should have been made that affect function of the site.

Screenshots (if appropriate):

Types of changes

[x ] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

[ ] My code follows the code style of this project.
[ ] My change requires a change to the documentation.
[ ] I have updated the documentation accordingly.
[ ] I have read the CONTRIBUTING document.
[ ] I have added tests to cover my changes.
[ ] All new and existing tests passed.

Vets-Who-Code / vets-who-code-app

Update index.json text only #469