Accessibility: few semantic improvements #181
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Closes #180
Fixed few minor accessibility issues reported in issue #180, no issues (issues from testing tools point of view only, didn't cover real world scenarios) after current fixes:

1. Why component: replace h4 to h3
Added some Tailwind classes to handle the styles based on this note from the main repo.
Since we're migrating to Tailwind classes to handle style, the updated styles are a bit slightly different than old styles, please let me know if this is ok.
Before
After
2. Posts component: replace h4 to h3
.text-lgchanged text font size to22.5pxfrom previous20px.Before
After
3. Global styles: remove some unneeded CSS after above changes
4. Base layout: add landmark element
5. Footer: add an accessible label for email input