Update communityNodes.md (#4999)

Added Average Images node

## What type of PR is this? (check all applicable)

- [ ] Refactor
- [ ] Feature
- [ ] Bug Fix
- [ ] Optimization
- [ ] Documentation Update
- [X] Community Node Submission


## Have you discussed this change with the InvokeAI team?
- [ ] Yes
- [X] No, because:

      
## Have you updated all relevant documentation?
- [X] Yes
- [ ] No


## Description
Added a new community node that averages input images.
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Millun Atluri 2023-10-30 11:15:11 +11:00 committed by GitHub
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@ -9,6 +9,7 @@ To download a node, simply download the `.py` node file from the link and add it
To use a community workflow, download the the `.json` node graph file and load it into Invoke AI via the **Load Workflow** button in the Workflow Editor.
- Community Nodes
+ [Average Images](#average-images)
+ [Depth Map from Wavefront OBJ](#depth-map-from-wavefront-obj)
+ [Film Grain](#film-grain)
+ [Generative Grammar-Based Prompt Nodes](#generative-grammar-based-prompt-nodes)
@ -33,6 +34,13 @@ To use a community workflow, download the the `.json` node graph file and load i
- [Help](#help)
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### Average Images
**Description:** This node takes in a collection of images of the same size and averages them as output. It converts everything to RGB mode first.
**Node Link:** https://github.com/JPPhoto/average-images-node
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### Depth Map from Wavefront OBJ