Add blogpost for release 1.3

@grote

Hi. Is this a good start?

It needs screenshots, but I don't know how to generate them

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• 4a322707 - Minor changes

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• cc745d8c - Add screenshots

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marked this merge request as ready

@grote since @c1e0's no longer paid for working on the project, feel free to add these fixes in a separate commit.

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• 14da9ced - Update 2021-briar-1.3-released.md

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added 1 commit

• 5d0940b9 - Update 1.3 release date and link

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added 1 commit

• d21ea37a - Update 1.3 release date and link

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added 3 commits

• 1c781ed2 - Update date, add link to eQ, small tweaks to wording.
• c97ff8af - Update list of funders.
• 642456a4 - Move image attachment screenshots to front.

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resolved all threads

merged