Update the landing page default content [#3455274]

Update the landing page demo content based on this figma

It’s the same content as provus new marketing website. the difference:

no change in variable colors. we’ll use the existing theme color
retain the header’s default content (do not copy the design)
remove the custom slideshow block
new marketing site uses a module to install this content. for provus core, it needs to be part of the installation profile step
please use your best judgement to make the landing page look good. we don’t have specific design to followl

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3455274-update-the-landing changes, plain diff MR !154
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