Add subsections for ingredients/instructions

[tomse]

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It would be nice to have the opportunity to split up the ingredients list into subsections.
and instructions

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have the possibility to split the ingredients list into subsections with a small headline.

i.e.
Dough
10g sugar
500g flour
50ml water
2 tsp salt

Filling
2 tblspoon cinnamon
2 tblspoon sugar
50g butter

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in order to have the servings work a number is required, which isn't pretty

0.01 Dough
10g sugar
500g flour
50ml water
2 tsp salt
0.01 Filling
2 tblspoon cinnamon
2 tblspoon sugar
50g butter

[seyfeb]

See #311