fix two broken links and update troubleshooting webhooks

[bwagner5]

1. Issue, if available:
N/A

2. Description of changes:

• Fix two broken links in previous website versions that shows up on the 404 checker when releasing. These sections should have been removed in those version since the dashboards are imported automatically beginning at v0.5.6.
• Fix troubleshooting webhooks section which is out-dated since the webhook and controller are now in the same pod.
• Fix inconsistent casing on the Getting Started landing page. All other links have "Started" capitalized except "Getting started with eksctl"

3. How was this change tested?

• make website

4. Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: link to issue
• No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[dewjam]

lgtm