Update homepage testimonial section

[gajindubandara]

Purpose

The purpose of this PR is to fix #1577

Goals

To update the home page testimonial section

Approach

Updated the home page testimonials & card styles

Screenshots

Preview Link

https://pr-1578-sef-site.surge.sh/

Checklist

• [x] I have read and understood the development best practices guidelines
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas

[gajindubandara]

Note -

1. Ramith and Nayanathara's designations have not yet been added. (I'll update it)
2. There is a CSS section used for the old testimonial styles in the global-custom file. Previously it was used for the home page testimonials and the upspeak page testimonial, shall we remove that old CSS section and update the upspeak page testimonial the same as the new home page testimonial section

WDYT?? @anjula-sack

[gajindubandara]

@gajindubandara this should be the preview link right?

• https://pr-1578-sef-site.surge.sh/

Can you change it?

Done!