Mrc 6043 tidy metadata page

[david-mears-2]

In this PR, I capitalized some lower case placeholder text on the home page, configured eslint so that it would run on my machine, and, primarily, introduced some organisation onto the metadata page.

https://mrc-ide.myjetbrains.com/youtrack/issue/mrc-6043/Make-git-execution-time-metadata-presentation-more-structured

Before

After

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.22%. Comparing base (6eb90f3) to head (04bb57d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #138   +/-   ##
=======================================
  Coverage   97.22%   97.22%           
=======================================
  Files         131      131           
  Lines        1225     1227    +2     
  Branches      339      341    +2     
=======================================
+ Hits         1191     1193    +2     
  Misses         33       33           
  Partials        1        1           

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