chore: update hero image

[platschi]

Description

• Update Hero Image
• Remove background gradient for HeroImage
• Fix Bug where you could scroll left and right on mobile landing page due to oversized TradeNow component width

Screenshots (if appropriate):

[vercel]

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Name	Status	Preview	Updated (UTC)
kwenta	✅ Ready (Inspect)	Visit Preview	Jul 12, 2023 9:35pm
kwenta-storybook	✅ Ready (Inspect)	Visit Preview	Jul 12, 2023 9:35pm

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (dev@ad9f599). Click here to learn what that means.
The diff coverage is n/a.

@@          Coverage Diff           @@
##             dev    #2584   +/-   ##
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  Coverage       ?   50.79%           
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  Lines          ?    11270           
  Branches       ?     2756           
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  Hits           ?     5725           
  Misses         ?     5306           
  Partials       ?      239           

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