Update documentation release 0.3.0

[HealthyPear]

Requirements

• Add mailmap file #72

Notes

• before approving the PR, please notify me so I can update the release date in the changelog and we don't need new PRs for this version
• this PR also removes some auxiliary scripts that either have been migrated to the GRID interface or judged not so useful after all

[codecov]

Codecov Report

Merging #80 (0156cc8) into master (e2fbeaf) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master     #80   +/-   ##
======================================
  Coverage    0.39%   0.39%           
======================================
  Files          20      20           
  Lines        2268    2268           
======================================
  Hits            9       9           
  Misses       2259    2259           

Impacted Files	Coverage Δ
protopipe/__init__.py	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e2fbeaf...0156cc8. Read the comment docs.

[HealthyPear]

@kosack could you approve once more? I just added the date of today to the changelog