Set opengraph attributes on org pages

[zeripath]

Fix #12778

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-commenter]

Codecov Report

Merging #12803 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #12803      +/-   ##
==========================================
+ Coverage   43.15%   43.18%   +0.02%     
==========================================
  Files         651      651              
  Lines       72134    72136       +2     
==========================================
+ Hits        31132    31150      +18     
+ Misses      35948    35938      -10     
+ Partials     5054     5048       -6     

Impacted Files	Coverage Δ
routers/org/home.go	66.66% <100.00%> (+0.75%)	⬆️
modules/git/utils.go	73.77% <0.00%> (-3.28%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
routers/repo/view.go	37.47% <0.00%> (-0.65%)	⬇️
modules/git/repo.go	49.23% <0.00%> (-0.51%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
services/pull/pull.go	41.57% <0.00%> (ø)
models/gpg_key.go	55.40% <0.00%> (+0.58%)	⬆️
models/error.go	35.66% <0.00%> (+0.85%)	⬆️
models/notification.go	67.04% <0.00%> (+0.91%)	⬆️
... and 5 more

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[6543]

works