content/static,internal/dl: add links for Creative Commons license

[rhnvrm]

Fixes golang/go#30371

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Patch Set 1:

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Message from Brad Fitzpatrick:

Patch Set 2:

(4 comments)

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This PR (HEAD: 2428b9d) has been imported to Gerrit for code review.

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Message from Agniva De Sarker:

Patch Set 5:

(1 comment)

Please also re-generate static.go by running "go generate ./content/static/". See README.md under content directory.

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This PR (HEAD: 2628f6b) has been imported to Gerrit for code review.

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Message from Agniva De Sarker:

Patch Set 6:

(1 comment)

Apologies for the to and fro. Just one more thing.

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Message from Agniva De Sarker:

Patch Set 7: Run-TryBot+1 Code-Review+1

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Message from Gobot Gobot:

Patch Set 7:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=5ee77e73

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Message from Gobot Gobot:

Patch Set 7: TryBot-Result+1

TryBots are happy.

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This PR is being closed because golang.org/cl/163746 has been merged.