Unify the formation of headers (h1) on pages

[nastasja83]

The header text on the pages is formed differently and in different tags.

• Title on an exercise page
• Title on the chapter page
• Title on solution page

We need to unify the formation of headings (h1), including to use the header text for SEO in the description of the <title> tag.

[Kolalexx]

Привет. Взял в работу данную задачу