Upgrade eleventy

[mroderick]

Purpose (TL;DR) - mandatory

How to verify - mandatory

1. Check out this branch
2. npm install

Contributor declaration

• [ ] I've read and followed the contributing document.
• [ ] The code I am submitting is mine to submit and is done so under the license of this repository.
• [ ] Where features have been changed, there are tests and documentation to accompany the entire contribution.

[codecov-commenter]

Codecov Report

Merging #83 (4aeb7ef) into master (e27e505) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #83   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           27        27           
  Lines          239       239           
=========================================
  Hits           239       239           

Flag	Coverage Δ
unit	100.00% <ø> (ø)

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