fix(repo): Rename all references to data and output dir

documentation/findings-per-policy-area.md

@@ -1,6 +1,6 @@
 # Summary of study findings
 
-written into 02-data/supplementary/findings-*.csv tables
+written into data/supplementary/findings-*.csv tables
 
 ## Institutional
 

documentation/validity_tool.md

@@ -1,6 +1,6 @@
 # Validity estimators
 
-For a general concept description see ../03-documentation/terms_of_reference-key_terms.md#validity
+For a general concept description see ../documentation/terms_of_reference-key_terms.md#validity
 
 From Maitrot2017 -> Section 4, Figure 3 and Appendix table notes
 They rank *only* quasi-experimental/experimental