Fix Wave audited accessibility errors on the home page E1304

[rija]

User story

As a website user
I want to be able to access the content on the home page
So that I can find the information I am looking for

Acceptance criteria

Given I have visual impairment
When I navigate to the home page
Then I can access the content

Additional Info

This is about fixing the Wave error report on that page.

• https://wave.webaim.org/
• this is part of Epic make gigadb.org accessible to all #1304

Product Backlog Item Ready Checklist

• Business value is clearly articulated
• Item is understood enough by the IT team so it can make an informed decision as to whether it can complete this item
• Dependencies are identified and no external dependencies would block this item from being completed
• At the time of the scheduled sprint, the IT team has the appropriate composition to complete this item
• This item is estimated and small enough to comfortably be completed in one sprint
• Acceptance criteria are clear and testable
• Performance criteria, if any, are defined and testable
• The Scrum team understands how to demonstrate this item at the sprint review

Product Backlog Item Done Checklist

• Item(s) in increment pass all Acceptance Criteria
• Code is refactored to best practices and coding standards
• Documentation is updated as needed
• Data security has not been compromised (with particular reference to the personal information we hold in GigaDB)
• No deviation from the team technology stack and software architecture has been introduced
• The product is in a releasable state (i.e. the increment has not broken anything)

[luistoptal]

this will be fixed by #2152