Allow linking to headers on news pages and the Features page

[Calinou]

On news pages and static pages like Features, we should add anchor link icons that appear when a heading is hovered. When the anchor icon is clicked, it navigates to an anchor link that can then be shared to others for easier referencing. For example: https://godotengine.org/features#xrsupport

[nsundriyal62]

please assign this issue to me !

[Ymanawat]

@Calinou I tried to do that and created a pull request, please review it.