RFR: 6840: [Accessibility, JAWS] 'Start Using JMC' link in Welcome Page is not traversable using Keyboard

[Suchita Chaturvedi]

Fixed the issue of making the link accessible using Keyboard and reading out the content.

Please review the change.

-------------

Commit messages:
 - 6840: [Accessibility, JAWS] 'Start Using JMC' link in Welcome Page is not traversable using Keyboard

Changes: https://git.openjdk.java.net/jmc/pull/177/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=177&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6840
  Stats: 4 lines in 2 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jmc/pull/177.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/177/head:pull/177

PR: https://git.openjdk.java.net/jmc/pull/177