feat: add essential links filter for about page

[Aryan-Techie]

Changes

• Added 'essential' property to social media links configuration
• Filter social links on the about page to show only essential ones
• Updated content.tsx with essential flag for each social link

Description

This PR introduces a new feature that allows filtering social links on the about page. By setting essential: true on social links in the configuration, you can control which links appear on the about page while keeping all links available elsewhere (footer).

Usage

Set essential: true in the social link configuration to display it on the about page:

{
  name: "GitHub",
  icon: "github",
  link: "https://github.com/once-ui-system",
  essential: true,
}

[vercel]

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[DovydasTEDS]

This feature could be nice, however, I wouldn't recommend adding the Instagram icon as it wouldn't be needed for this specific feature, but instead making a separate PR for it.

[Aryan-Techie]

@DovydasTEDS I agree that the Instagram icon isn’t essential for this specific feature, but it’s intentionally included.