Update How to Add External Incentive Gauges onto the Osmosis Pools Page

[gnujoow]

Summary

from the issue blow, external gauge is moved to nextjs server but the guide still guide old way https://github.com/osmosis-labs/osmosis-frontend/issues/853 https://github.com/osmosis-labs/osmosis-frontend/issues/1182 https://github.com/osmosis-labs/osmosis-frontend/issues/1190

Problem Definition

Proposal

update https://github.com/osmosis-labs/docs/blob/main/docs/overview/integrate/frontend.md#steps-2 to deliver accurate information

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[daniel-farina]

@JeremyParish69

[JeremyParish69]

Thanks for this @gnujoow , you are correct this is outdated information and have started on working to update appropriately