Update `Community` photoset

[hsbt]

I picked photo for Community section from my personal and conference organizer libraries.

I would like to update photo from the following area:

• African community
• Middle-South Asian community
• South American community

@vipulnsward @banta @rafaelfranca (/cc @AmandaPerino ) Do you have 1-2 photos that show your community's activities like the following?

[banta]

Hi @hsbt, yes, I'll share some photos soon. What are the required dimensions?

[banta]

Hi @hsbt, please see the photos below

[hsbt]

@banta Thanks! I update with your photos at #3732

[santib]

Hey @hsbt just in case it helps, here there is a recent photo from the Ruby Meetups in Uruguay (South America)

[hsbt]

@santib Great! I added your photo at #3738