[BITV]: Clean up headings

[JuliaKirschenheuter]

There are 2 problems:

1. Content overlapping:
   

2. <h1 data-v-27fc3f3a="" class="hidden-visually"> Photos </h1> is a duplicate of <h2 data-v-21ecc79e="" class="photos-navigation__title__main"> Photos </h2>. Then we have the same issue as [BITV] 9.1.3.1a/6.1 - The page has two identical headings labeled "Personal info" which have been marked as "h1" and "h2" headings. This should be avoided. (1) server#41826
   Todo: remove visually hidden <h1> and move visual <h2> to <h1>