replace obsolete `<p align="">` and added `<img alt="">` in README.md #7787

Job	Run time
Debug and Prebuilt (All Tests by Package + Canary Features)	6m 18s
Linting	1m 19s
Type Checking (current version)	1m 30s
Blueprint Tests	4m 17s
Type Checking (other supported versions) (4.9)	1m 48s
Type Checking (other supported versions) (5.0)	1m 31s
Type Checking (other supported versions) (next)	1m 26s
Production (All Tests + Canary Features)	6m 3s
Browserstack Tests (Safari, Edge)	3m 28s
Extend Prototypes	3m 8s
Browser Tests (Firefox)	2m 25s
Node.js Tests	1m 50s
Production (All Tests + Canary Features with Debug Render Tree)	4m 2s
Smoke tests (Full Ember Apps)	2m 42s
Notify Discord	0s
Publish channel to s3	0s
Deploy tags to npm	0s
Publish alpha from default branch	0s
	41m 47s

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