UI update of the speaker's card

[anuragsingh228]

Issues with current card:

• The image to give a 4-color border, shifts when the screen width is reduced.
• The size of the card is a little big.
• The texts are very bold.

Inspiration Links:

• [https://devfestindia.com/speakers](Devfest speakers list)
• We can take inspirations from these type of cards
• 

[xprilion]

Fixed in #34