docs: update community meeting section (#5364)

* tidy: capitalise like other sections.

Signed-off-by: Erik Westra <e.s.westra.95@gmail.com>

* fix: update bi-weekly development meeting section of README.md

Signed-off-by: Erik Westra <e.s.westra.95@gmail.com>

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Signed-off-by: Erik Westra <e.s.westra.95@gmail.com>
Co-authored-by: Jakob Möller <jakob.moeller@sap.com>
Co-authored-by: Gergely Brautigam <skarlso777@gmail.com>