Remove "Exploring recommended repositories" section from about-your-personal-dashboard.md

[moraesc]

Why:

We are removing the Explore Repositories section that currently exists on the right side bar of the dashboard as a part of the New User Dashboard Refresh release in effort to clean up the dashboard and provide more relevant content for new users, and because this section has been incorporated with the Feed. As a result, we should remove the "Exploring recommended repositories" section from this doc.

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

The "Exploring recommended repositories" section in about-your-personal-dashboard.md is being removed.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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Table of review links

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Source	Review	Production	What Changed
account-and-profile/setting-up-and-managing-your-personal-account-on-github/managing-user-account-settings/about-your-personal-dashboard.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13	fpt ghec ghes@ 3.17 3.16 3.15 3.14 3.13

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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