Automated accessibility testing for Openliberty APIs and SPIs in docs

[navaneethsnair1]

What was changed and why?

Code to automate accessibility testing of Openliberty APIs and SPIs of docs page

Tested using browser:

• [ ] Firefox (Desktop)
• [ ] Safari (Desktop)
• [ ] Chrome (Desktop)

Did you test accessibility:

• [ ] IBM Equal Access Accessibilty Checker
• [ ] Jaws (only relevant for new UX flows)