Adds basic custom visualization workflow example app

[merschformann]

Description

This PR adds a basic workflow app for generating custom visuals.

Changes

• Adds the python-wf-custom-visuals app as a basic example for generating custom visuals using a workflow app.
• Fixes GH pages content.

Custom Visual Sneak Peek

Resolves ENG-6117

[Copilot]

Pull Request Overview

This PR introduces a basic workflow app for generating custom visuals while also updating GitHub Pages content links.

• Adds the "python-wf-custom-visuals" example app along with its workflow definition and supporting assets.
• Updates image URLs in the "python-wf-ortools-region-allocation" README to reflect the new asset paths.
• Removes the GitHub Pages static deployment workflow file.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
python-wf-ortools-region-allocation/README.md	Updates image URLs and "Next steps" section to point to the correct asset paths.
python-wf-custom-visuals/requirements.txt	Adds necessary dependencies for the custom visuals app.
python-wf-custom-visuals/main.py	Introduces the workflow definition, including steps for input preparation, sub-app execution, and custom visual asset generation.
python-wf-custom-visuals/input.json	Provides sample input data for the custom visuals workflow.
python-wf-custom-visuals/app.yaml	Configures the app runtime and pip requirements.
python-wf-custom-visuals/README.md	Documents how to run the custom visuals workflow locally and remotely.
.nextmv/readme/workflow-configuration.yml	Adds configuration entries for the new custom visuals app.
.nextmv/readme/python-wf-custom-visuals/*.sh	Provides example scripts for both local and remote execution of the workflow.
.github/workflows/static.yml	Removed the GitHub Pages deployment workflow, likely as part of a GH pages content fix.

Comments suppressed due to low confidence (2)

python-wf-ortools-region-allocation/README.md:76

• Ensure the updated image URLs are correct and that assets are correctly hosted in the new paths. Also verify that all corresponding documentation references are current.

+![sneak peek demand](https://nextmv-io.github.io/community-apps/apps/python-wf-ortools-region-allocation/demand.png)

.github/workflows/static.yml:1

• Confirm that the removal of the GitHub Pages deployment workflow is intentional and that static content deployment is being managed through an alternative process.

Removed static workflow for GitHub Pages deployment

[sebastian-quintero]

LGTM