Support PagesSource as struct for update pages API

[gesellix]

Closes #2406

[gmlewis]

Thank you, @gesellix - please run tests locally and make sure they pass. See CONTRIBUTING.md for more information.

[gesellix]

Sorry, my bad - I had read the CONTRIBUTION.md, but ignored them. Obivously 😓
Please leave some feedback if you want me to adjust the other changes or if I should squash the commits.
Thank you, @gmlewis!

[gmlewis]

Thank you, @gesellix ! There's no need to squash commits, because we always do that upon merge in this repo... thank you, though.
LGTM.

Awaiting second LGTM+Approval from any other contributor to this repo before merging.

[codecov]

Codecov Report

Merging #2407 (24023c4) into master (fd22ee9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2407   +/-   ##
=======================================
  Coverage   98.06%   98.06%           
=======================================
  Files         119      119           
  Lines       10546    10546           
=======================================
  Hits        10342    10342           
  Misses        140      140           
  Partials       64       64           

Impacted Files	Coverage Δ
github/repos_pages.go	97.11% <ø> (ø)

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[gesellix]

@gmlewis do I have to find someone to review and put another LGTM on this PR? I'm not sure how we can progress on this one. This isn't meant to put any pressure on you or the other maintainers, though :)

[gmlewis]

@gesellix - We rely on contributors of this repo to help review the outstanding PRs... feel free to review other open PRs if you have time. 😄
I hate to call out individual contributors, but @Parker77 has been extremely helpful in the past and maybe he has time to review this one to help move it forward.

[Parker77]

LGTM!

[gmlewis]

Thank you, @Parker77! We appreciate it.
Merging.

[gesellix]

Great, thanks a lot @Parker77 @gmlewis !
I'll certainly try to help with the other reviews, this feels like true open source :)