docs: Add release notes for 19.1.0
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com> (cherry picked from commit 1517811f4f75cd628dd7122d63092f3954a81a7d)
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Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com> (cherry picked from commit 1517811f4f75cd628dd7122d63092f3954a81a7d)