feat: update landing page layout and content

[signekb]

Description

• This PR updates the layout and content of the landing page.
• The layout follows Brainstorm better landing page layout for main website #239
• I have rewritten the goals by putting two of the existing goals into one ("To create a framework for setting up an infrastructure for health data" and "To develop the framework as installable software") and adding a goal of "leading by example". What do you think?
• I have also added a "definition" of a data resource to make it a bit clearer for new users what is meant there.
• These changes are done to make the landing page more visually appealing and to update the content that users/visitors of the webpage meet first.

Related Issues

Closes #144 and #241

See also Issues #...

Reviewer Focus

This PR requires an in-depth review.

Checklist

For all PRs that are not general documentation

• Tests accompany or reflect changes to the code
• Tests ran and passed locally
• Ran the linter and formatter
• Build has passed locally
• Relevant documentation has been updated

For general documentation:

• Spell-check
• Did the page(s) preview correctly on your machine without breaking
• New category words (keywords) (if any) added to the code snippet file (none)

[lwjohnst86]

Very nice! I've made some changes, like reduce amount of text and put the NNF logo and text into columns.

[signekb]

This looks a bit crazy. @lwjohnst86 was this your formatter that did this?

[signekb]

Same with L62 with seven colons?

[lwjohnst86]

I know... I used the same VSCode formatter we've all been using, not sure why it did that and I didn't have time to look into it. It is weird for sure... I thought it was a mistake at first, so fixed it, than ran formatter again and it did it again 😠 💢

[signekb]

Weird! Which formatter is this? I don't think it happens to me??

[signekb]

Nice with the shorter texts! 🎉

[signekb]

@lwjohnst86 Why is this without {} in contrast to e.g., L29-30?

[lwjohnst86]

@signekb when only one class is provided, the formatter removes the {}. It's not me!! 😛

[signekb]

Very weird!