Add older blog posts and author images

[jonasrosland]

Add older blog posts as noted in #955 , and add images/links for the authors.

Signed-off-by: jonasrosland [email protected]

[codecov-io]

Codecov Report

Merging #958 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #958     +/-   ##
=========================================
- Coverage   47.62%   47.53%   -0.1%     
=========================================
  Files          76       76             
  Lines        5291     5291             
=========================================
- Hits         2520     2515      -5     
- Misses       2617     2620      +3     
- Partials      154      156      +2

Impacted Files	Coverage Δ
pkg/plugin/aggregation/aggregator.go	72.67% <0%> (-3.11%)	⬇️

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