Fix 'Getting started' link in README.md (IMAP-Science-Operations-Center#2668)

Updated the link for the 'Getting started' section in the README.

Author: maxinelasp

README.md

@@ -18,7 +18,7 @@ Join the IMAP Git repository to be part of an exciting scientific endeavor, cont
 
 [IMAP Processing Documentation](https://imap-processing.readthedocs.io/en/latest/)
 
-[Getting started](https://imap-processing.readthedocs.io/en/latest/development-guide/getting-started.html)
+[Getting started](https://imap-processing.readthedocs.io/en/latest/development/index.html)
 
 # Credits
 [LASP (Laboratory of Atmospheric and Space Physics)](https://lasp.colorado.edu/)