improve documentation (#43)

* fix permissions

* add links to sub-READMEs

README.md

@@ -4,7 +4,7 @@ The OAPEN Suggestion Engine will suggest ebooks based on other books with simila
 
 ## Running server
 
-You can run all the servers together with `./all-dev.sh` -- after installing dependencies with `./setup.sh`
+You can run all the servers together with `./all-dev.sh` -- after installing dependencies with `. ./setup.sh`
 
 ## Monorepo components
 
@@ -17,6 +17,8 @@ Our suggestion service is centered around the trigram semantic inferencing algor
 
 You can find the code for the mining engine in `oapen-engine/`.
 
+Information about running the mining engine is in [`oapen-engine/README.md`](oapen-engine/README.md).
+
 **Base dependencies**:
 * Python v3.10
 * PIP package manager
@@ -44,6 +46,8 @@ This API server returns a list of recommended books from the database.
 
 You can find the code for the API engine in `api/`.
 
+Configuration info for the API engine is in [`api/README.md`](api/README.md).
+
 **Base dependencies**:
 * NodeJS 14.x+
 * NPM package manager
@@ -64,6 +68,8 @@ This is a web-app demo that can be used to query the API engine and see suggeste
 
 You can find the code for the web demo in `web/`.
 
+Configuration info for the web demo is in [`web/README.md`](web/README.md).
+
 **Base dependencies**:
 * NodeJS 14.x+
 * NPM package manager