Fixed linking between pages (Support page, Sign-up, Sign-in buttons) and alt image description

[Kyrushiqi]

Fixed the following issues:

• When on the Support page unable to navigate back to homepage and their respective sections (Use Tracker and How it works). Fixed the linking problem.
• Fix the alt image description. Made it more descriptive.
• The Sign-up and Sign-in buttons on their respective pages were broken and did not navigate to the Homepage. After adding some javascript code, both buttons work.

[netlify]

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[neeraj542]

@Kyrushiqi plz resolve conflicts accordingly