Make repository sharable with other PREDICT partners

[noamross]

• [x] Remove data
  • Keep a .gitignore file in the data directory so git retains the directory
  • Remove Malaysia-building script
  • Use https://rtyley.github.io/bfg-repo-cleaner/ to clear these files out of git history (you will need to git push --force after this and others will need to re-clone).
  • .gitignore all the data files.
• [x] Add data download to the main CI pipeline
  • The download step is now only in the "nightly" build job - add this to the main one
  • (Optional) Cache the data on CircleCI - have the data download write the date to a file, and use this file's contents to check whether new data should be downloaded. (This reduces build times but that's less of an issue as we'll be updating this repo less often).
• [x] Write short instructions in the README
  • Remove link to Doc
  • "Use devtools::install_deps() to install all neededed packages (found in the DESCRIPTION file"
  • Link to https://ecohealthalliance.github.io/eidith/reference/ed_auth.html for setting credentials
  • Downloading, building one report, building all reports
  • "This repository also contains elements for automatic building and testing specific to EcoHealth Alliance infrastructure."
  • Ask a country liason not familiar with this process to try to build a report based on the instructions.