[ENH] add steering group minutes 2021

[Remi-Gau]

relates to #294

new pages

• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/05/20/steering-group-minutes
• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/06/10/steering-group-minutes
• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/07/01/steering-group-minutes
• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/08/12/steering-group-minutes
• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/09/02/steering-group-minutes
• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/11/04/steering-group-minutes
• https://deploy-preview-302--astounding-beignet-8ca2d6.netlify.app/2021/12/14/steering-group-minutes

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[Remi-Gau]

yeah actually just checking a couple of those links make me realize that it gives access to some forms in edit mode or something similar.

will do a check to remove those manually

[Remi-Gau]

OK merging this one and sending another batch with the minutes of 2022 in another PR