Create pages for each ripple ff (#709)

Mikhail Svechnikovrequested to merge
i709 into main

Issue #709 (closed) appeared due to misunderstanding of cosine ripple shape and dimensions.

The integral should look

V = 0.5 \space L H \cdot \int_{-\frac{W}{2}}^{\frac{W}{2}} (1 + \cos \left( \frac{2\pi}{W} x \right)) dx = \frac{H W L}{2} .

So each ripple should have its own page to avoid ambiguity of interpretation.

This MR splits the ripple page into a few and adds corresponding examples to produce the figures.

After merging this MR and leaving a comment with explanation in #709 (closed), the issue can be closed.

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