Resolved issue #2971

[davejsdev]

• Changed h2 to h1 in template to adhere to accessibility guidelines.
• Added h1 styles to maintain same font size.
• Changed div tag to the semantically correct header tag for header in template.

Verification of changes:

1. Created new React app using the modified branch.
2. Checked code to ensure the h2 tag has been replaced with the h1 tag.
3. Ran npm start and verified the font size of new h1 tag matches the former h2 tag in browser.