Live updating of Marburg

[ruthmccabe]

The live updating page of Marburg has broken and needs fixing - @tristan-myles to provide further details

[tristan-myles]

pathogen_marburg.Rmd was written using v0.1.0 of epireview. Data are loaded in this version of epireview using data_forest_plot. The current approach to creating a dynamic link between latest data, while keeping epireview functions fixed at a particular version, is to use raw url for the csv data. With the v0.1.0 of epireview, this approach is not possible due to the how data is loaded in data_forest_plot.