[OUDS] Docs: add 'Helpers > Text truncation' page

[vprothais]

Related issues

Listed in #2589.

Description

This PR adds the "Helpers > Text truncation" page based on:

• the previous corresponding Boosted page (see code source)
• the previous corresponding Bootstrap page (see code source)

Types of change

• New documentation (non-breaking change which adds functionality)

Live previews

• https://deploy-preview-2670--boosted.netlify.app/docs/0.0/helpers/text-truncation/

[netlify]

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