Fixed broken links in README.md

[harshmathurx]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
Fixes broken links in the README.md file

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #424

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• squashed commits
• includes documentation
• adds unit tests

Release note: NONE
-->

    NONE

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[harshmathurx]

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Just signed the agreement :)

[k8s-ci-robot]

@harshmathurx: PR needs rebase.

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[dims]

https://raw.githubusercontent.com/kubernetes-sigs/cluster-api/master/docs/book/src/images/introduction.png would. be better? (avoid SHA)

[harshmathurx]

Yes, thank you.
I made that change

[jayesh-srivastava]

lgtm

[jayesh-srivastava]

@harshmathurx You'll have to rebase the PR.

[MadhavJivrajani]

/ok-to-test

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