Refactor the getting started guide

[Amulyam24]

What this PR does / why we need it:
This PR refactors the doc with a better structure.

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 #1152

Special notes for your reviewer:

/area provider/ibmcloud

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

Release note:

Refactor the getting started guide

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Amulyam24 / name: Amulya Meka (b7ecc76)

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[Amulyam24]

/cc @Karthik-K-N

[Prajyot-Parab]

/lgtm

[Karthik-K-N]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Amulyam24, mkumatag, Prajyot-Parab

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• OWNERS [mkumatag]

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[Prajyot-Parab]

/cherrypick release-0.5

[k8s-infra-cherrypick-robot]

@Prajyot-Parab: new pull request created: #1326

In response to this:

/cherrypick release-0.5

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[Prajyot-Parab]

/cherrypick release-0.4

[k8s-infra-cherrypick-robot]

@Prajyot-Parab: #1324 failed to apply on top of branch "release-0.4":

Applying: Refactor the getting started guide
.git/rebase-apply/patch:40: trailing whitespace.
    
.git/rebase-apply/patch:42: trailing whitespace.
     
.git/rebase-apply/patch:44: trailing whitespace.
   
.git/rebase-apply/patch:73: trailing whitespace.
6. Once the management cluster is ready with the required providers up and running, proceed to provisioning the workload cluster. Check the respective sections for [VPC](/topics/vpc/creating-a-cluster.html) and [PowerVS](/topics/powervs/creating-a-cluster.html) to deploy the cluster. 
.git/rebase-apply/patch:102: trailing whitespace.
      
warning: 5 lines add whitespace errors.
Using index info to reconstruct a base tree...
M	docs/book/src/getting-started.md
Falling back to patching base and 3-way merge...
Auto-merging docs/book/src/getting-started.md
CONFLICT (content): Merge conflict in docs/book/src/getting-started.md
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Refactor the getting started guide
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherrypick release-0.4

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.