Fix/category-creation-position

[henriquecbuss]

What issue does this PR close

Closes N/A. We're talking about this on Slack: https://cambiatus.slack.com/archives/CA83HJAAD/p1660676306254949 and https://cambiatus.slack.com/archives/CA83HJAAD/p1660648202151329

Changes Proposed ( a list of new changes introduced by this PR)

• Send the correct position (instead of always sending 0)
• Order categories by position

How to test ( a list of instructions on how to test this PR)

Try to create new categories!

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[henriquecbuss]

@lucca65 do you think we should wait for cambiatus/backend#283 (specifically the bug about creating categories in communities that don't have them - is it gonna be dealt with in that PR?), or can we merge this one?