magento/pwa-studio#: Contributing page. Fix link

[atwixfirster]

Description

Regarding to #1557 a correct URL to "Code of Conduct" is

https://github.com/magento/pwa-studio/blob/develop/.github/CODE_OF_CONDUCT.md

Related Issue

Closes #ISSUE_NUMBER.

Verification Steps

1. Go to the https://magento.github.io/pwa-studio/technologies/contribute page.
2. Click on the "Code of Conduct" link

Actual result: you will be redirected to https://github.com/magento/pwa-studio/blob/master/.github/CODE_OF_CONDUCT.md

Expected result: you should be redirected to https://github.com/magento/pwa-studio/blob/develop/.github/CODE_OF_CONDUCT.md

Affected pages

• https://magento.github.io/pwa-studio/technologies/contribute

Checklist

• I have updated the documentation accordingly, if necessary.
• I have added tests to cover my changes, if necessary.

Thank you!

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[atwixfirster]

@jcalcaben , could you please add Partner: Atwix, partners-contribution labels to this pull request?

Many thanks

[atwixfirster]

@dpatil-magento could you please add Partner: Atwix, partners-contribution labels to this PR?

Thank you!