Page parameter for repo search API

[ethantkoenig]

Right now, there is no way to get more than the first 50 repos from the /repos/search API endpoint.

Also makes some tweaks to the endpoint's swagger docs.

[codecov-io]

Codecov Report

Merging #2915 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2915      +/-   ##
==========================================
+ Coverage   27.24%   27.26%   +0.01%     
==========================================
  Files          89       89              
  Lines       17640    17640              
==========================================
+ Hits         4806     4809       +3     
+ Misses      12146    12144       -2     
+ Partials      688      687       -1

Impacted Files	Coverage Δ
modules/process/manager.go	73.91% <0%> (+4.34%)	⬆️

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[lafriks]

LGTM

[Bwko]

LGTM