[Add-ins][All hosts] Add links to the Dev Program

[mscharlock]

Putting some cross-links to the dev program seems to me like it would be a good idea since we rarely expose it in our docs. :)

[o365devx]

Docs Build status updates of commit 106a51e:

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[alison-mk]

Makes sense to me! Looks good. Two minor suggestions/questions.

[alison-mk]

Line 84 seems similar to line 82, do we need both links?

[ElizabethSamuel-MSFT]

@mscharlock Note that Developer Program is in the header on docs though:

[mscharlock]

@mscharlock Note that Developer Program is in the header on docs though:

This is specific to an experiment to see if this drives any engagement with the program. I don't think the header is prominent enough for people to notice and sign up.

[o365devx]

Docs Build status updates of commit 3f79de5:

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docs/develop/develop-overview.md	✅Succeeded	View
docs/excel/custom-functions-overview.md	✅Succeeded	View
docs/excel/excel-add-ins-overview.md	✅Succeeded	View
docs/onenote/onenote-add-ins-programming-overview.md	✅Succeeded	View
docs/outlook/outlook-add-ins-overview.md	✅Succeeded	View
docs/overview/explore-with-script-lab.md	✅Succeeded	View
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docs/overview/learning-path-transition.md	✅Succeeded	View
docs/overview/office-add-ins.md	✅Succeeded	View
docs/overview/patterns-and-practices-overview.md	✅Succeeded	View
docs/overview/set-up-your-dev-environment.md	✅Succeeded	View
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docs/resources/resources-links-help.md	✅Succeeded	View
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[o365devx]

Docs Build status updates of commit 541ba52:

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docs/excel/custom-functions-overview.md	✅Succeeded	View
docs/excel/excel-add-ins-overview.md	✅Succeeded	View
docs/onenote/onenote-add-ins-programming-overview.md	✅Succeeded	View
docs/outlook/outlook-add-ins-overview.md	✅Succeeded	View
docs/overview/explore-with-script-lab.md	✅Succeeded	View
docs/overview/learning-path-beginner.md	✅Succeeded	View
docs/overview/learning-path-transition.md	✅Succeeded	View
docs/overview/office-add-ins.md	✅Succeeded	View
docs/overview/patterns-and-practices-overview.md	✅Succeeded	View
docs/overview/set-up-your-dev-environment.md	✅Succeeded	View
docs/powerpoint/powerpoint-add-ins.md	✅Succeeded	View
docs/project/project-add-ins.md	✅Succeeded	View
docs/resources/resources-links-help.md	✅Succeeded	View
docs/word/word-add-ins-core-concepts.md	✅Succeeded	View
docs/word/word-add-ins-programming-overview.md	✅Succeeded	View

For more details, please refer to the build report.

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