Add screenshots to Getting Started guide

[serboctor]

Add screenshots of policy features in Weave GitOps in the getting started guide.

[codecov[bot]]

Codecov Report

Merging #183 (a470570) into master (68162fc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #183   +/-   ##
=======================================
  Coverage   78.34%   78.34%           
=======================================
  Files          22       22           
  Lines        1390     1390           
=======================================
  Hits         1089     1089           
  Misses        229      229           
  Partials       72       72           

Flag	Coverage Δ
unit	78.34% <ø> (ø)

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