Miscellaneous changes

[joshwlambert]

This PR makes a few small changes to the package.

• The version of R and DAISIE are incremented to 4.2 and 4.4.0, respectively
• The relaxed-rate DAISIE model now has an initial DAISIE optimisation to get better initial conditions (in run_daisie_ml.R)
• Removed an old documentation section causing warning

[codecov]

Codecov Report

Merging #31 (86b05ff) into master (5e8a570) will decrease coverage by 0.98%.
The diff coverage is 5.26%.

❗ Current head 86b05ff differs from pull request most recent head 91b7bb4. Consider uploading reports for the commit 91b7bb4 to get more accurate results

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
- Coverage   66.77%   65.80%   -0.98%     
==========================================
  Files          25       25              
  Lines        1183     1202      +19     
==========================================
+ Hits          790      791       +1     
- Misses        393      411      +18     

Impacted Files	Coverage Δ
R/run_daisie_ml.R	68.60% <5.26%> (-17.97%)	⬇️