feat(ui-markdown-editor): center align h1 tags - I146

[Udbhavbisarya23]

Signed-off-by: Udbhavbisarya23 udbhavbisarya46.ub@gmail.com

Closes #146

Changed Heading and Made changes to font sizes of ui-markdown-editor

Changes

• Center Aligned the H1 tags
• Changed font size and line height of h4,h5 and h6tags to 15,14 and 13 px respectively (As it is in PDF)

Screenshots or Video

Author Checklist

• [x] Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• [ ] Vital features and changes captured in unit and/or integration tests
• [x] Commits messages follow AP format
• [ ] Extend the documentation, if necessary
• [x] Merging to master from fork:branchname
• [ ] Manual accessibility test performed
  • [ ] Keyboard-only access, including forms
  • [ ] Contrast at least WCAG Level A
  • [ ] Appropriate labels, alt text, and instructions

[Udbhavbisarya23]

Thank you @irmerk and @dselman !