Add content for templates in vela-tutorials about community

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[plyr4]

theres plenty of content in
https://go-vela.github.io/docs/templates/tutorials/ (could use more instances)
and https://go-vela.github.io/docs/tour/templates/
if we feel the need for more content, more concise issues would be appreciated and helpful

[plyr4]

as an aside, there is a lot of additional content in go-vela/vela-tutorials that could be migrated to the doc-site, lets do that