Issue 9: Getting started vignette (#32)

* Rewriting and scoping out getting started vignette

* Basic version of code functionality

* Rewrite data simulation section

* Split up data observation process writing

* Rewrite Section 1 on data simulation

* Start writing the fitting section, and edits to Section 1

* Add epidemic growth figure

* Add plot of lognormal

* Add delays figure (and move to every 50th case)

* Improve figures here

* Fix lint issues

* Change from html_vignette2 to html_document2

* Change to fig.path

* Fixes based on Katie comments

* Work on the modelling section writing

* Improvements to first vignette based on Sam feedback

* Fix args problem, first go at results in at the end

* Resolve some remaining issues

* Fix lint issues

Former-commit-id: 125b206e3480fcdbd4471b33b967beb32c2f1f4e [formerly 6da89db91761e0693f7ba9d0af28f59d5fc42bff]
Former-commit-id: 43091c955bdb0cbfa15e0f5a88befe3bdafa1001

DESCRIPTION

@@ -34,7 +34,8 @@ Suggests:
     epinowcast,
     testthat (>= 3.0.0),
     readxl,
-    janitor
+    janitor,
+    gt
 Remotes:
     stan-dev/cmdstanr,
     Rdatatable/data.table,