Add links to technical guidence.

[robert-zaremba]

Summary

Recently, @barriebyron engaged in documentation review and provided very valuable feedback and suggestion. Let's create a
developer documentation style guide

Problem Definition

Cosmos SDK is created for the whole community. Good, easy to read documentation is essential for adoption.

Proposal

Create a page for developer documentation style guide. Maybe we can reuse: https://www.notion.so/Technical-content-style-guidance-b896877847a547518d3dff33fac7366a?

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[robert-zaremba]

@alessio , @barriebyron - are you OK to copy https://www.notion.so/Technical-content-style-guidance-b896877847a547518d3dff33fac7366a in to docs/style-guide.md?