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Fix duplicate id `#firstHeading`

Authored by Volker_E.

Description

Fix duplicate id #firstHeading

Fixing recurring id #firstHeading in #side-menu and
also changing <h1> to <h6> for better heading structure.

Bug: T110983
Change-Id: I2d9ed1d7c4a34cbaefceb5e79cccd52dfc1af323

Details