Insights page should provide documentation on how to configure it

Problem to solve

When you first land on the Insights page and have not yet configured it, (example) there is no information regarding what you should use this page for or that you can customize it. It looks like when this page is empty, there might be a banner shown that points you to configure it, but because we have a default Issues and Merge Request dashboard, you are left thinking this is all there is to offer.

Solution

1. Adding a description (line of text) under the Insight page title, so that people understand how to use it and what value it can provide.
2. Add link to the documentation.
3. Text:

Configure a custom report for insights into your group processes such as amount of issues, bugs, and merge requests per month. How do I configure an insights report?

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Screenshot	Note
	Screenshot created by copying the markup and styles from Analytics > Code review. It is provided as an example rather than as an implementation guide 😅

Implementation plan

• Update the insights.vue component to include description text
• The text should read Configure a custom report for insights into your group processes such as amount of issues, bugs, and merge requests per month. How do I configure an insights report?
• The text: How do I configure an insights report? should link to https://docs.gitlab.com/ee/user/group/insights/#configure-your-insights

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