LandWeb manual and user guide

[achubaty]

• [x] update all modules to use new module Rmd template to allow autobuilding of manual;
• [x] update instructions for getting started with LandWeb (installation etc.);
• [x] update instructions for running the model;
• [x] update instructions for modifying the model (e.g., update LTHFC map);
• [x] review formatting etc. of HTML manual (primary version accessed by most users?);
• [ ] review formatting etc. of PDF manual, especially tables (less likely to be used? lower priority);
• [x] configure GitHub Actions to autobuild and render the manual;
• [ ] update/consolidate NEWS files and incorporate into the manual;
• [ ] update + improve 'Study areas' chapter;
• [ ] improve LandWeb_preamble documentation;
• [ ] update + improve 'Vegetation submodel' chapter;
• [ ] update + improve 'Wildfire submodel' chapter;
• [ ] improve LandMine documentation for new mode and new diagnotic plots;
• [ ] update + improve 'Model outputs' chapter;
• [ ] improve LandWeb_output documentation;
• [ ] improve LandWeb_summary documentation;
• [ ] improve timeSenceFire documentation;
• [x] add burnSummaries module to manual;
• [ ] improve burnSummaries documentation;
• [ ] add Biomass_diagnotics module to manual;
• [ ] improve Biomass_diagnostics documentation;
• [ ] add chapter discussing differences between v2 and v3, with sample outputs;
• [ ] fix R package citation issues (e.g. R-base);