docs: update icons in readme architecture

[marktayl1]

Purpose

• ... Changed marketing icons in architecture image to match new branding from Ignite

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information