Fix broken links in README

Updated some links in the README files so that they pointed to real locations.

Author: enkessler

README.md

@@ -31,7 +31,7 @@ cd snip
 ```
 
 To view client/server installation instructions, open the respective directories. 
-> [client](/tree/master/client#snip-website) | [server](/tree/master/server#snip-website)
+> [client](/client#snip-website) | [server](/server#snip-api)
 
 Note: You will need at least NodeJS 10.18.1+, VSCode 1.44+, Yarn 1.17.3+ and MongoDB 3+. You will also need to configure .env variables before launching.