fix: Preserve longDescription paragraphs in Markdown

[LachyTech]

This patch preserves paragraphs entered in the longDescription field by converting each line to <p> elements in HTML, which is converted to a paragraph in markdown via the touchdown service.

Only lines with non-whitespace characters are displayed in the preview.

I considered enclosing the longDescription field in <pre> tags as a simpler approach but single linebreaks wouldn't appear as paragraphs in markdown which is counter-intutive for a non-markdown user.

Related issue: https://github.com/danielcranney/profileme-dev/issues/177

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