Make more clear that configuration page is about the APIcast configuration

[thomasmaas]

Closes https://issues.redhat.com/browse/THREESCALE-4242

• make more clear that this about staging apicast configs and not staging their API
• show version above promote button so button text doesn't get too long

before:

after:

[codecov]

Codecov Report

Merging #1543 into master will decrease coverage by 1.43%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1543      +/-   ##
==========================================
- Coverage   85.81%   84.37%   -1.44%     
==========================================
  Files        2464     2230     -234     
  Lines       80586    69316   -11270     
==========================================
- Hits        69151    58487   -10664     
+ Misses      11435    10829     -606

Impacted Files	Coverage Δ
app/helpers/api/integrations_helper.rb	70.14% <0%> (-2.99%)	⬇️
lib/tasks/services.rake	56.66% <0%> (-30.84%)	⬇️
app/lib/cms/s3.rb	75.86% <0%> (-9.44%)	⬇️
.../admin/dashboard/service/top_traffic_controller.rb	71.42% <0%> (-3.58%)	⬇️
...rovider/admin/dashboard/service/hits_controller.rb	50% <0%> (-2.95%)	⬇️
lib/tasks/multitenant/tenants.rake	41.5% <0%> (-5.67%)	⬇️
...est/unit/three_scale/swagger/specification_test.rb	97.43% <0%> (-2.57%)	⬇️
...s/provider/admin/cms/email_templates_controller.rb	41.66% <0%> (-0.65%)	⬇️
...ib/developer_portal/lib/liquid/drops/pagination.rb	91.66% <0%> (-0.2%)	⬇️
app/subscribers/after_commit_subscriber.rb	96.42% <0%> (-0.13%)	⬇️
... and 736 more

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