Update some obsolete references

Some links were still pointing to `/keyboards/ergodox_ez`, while the
directory is `/keyboards/erdogox` now.

Not all references have been updated, and some of the text here and
there may need updating to mention the ErgoDox Infinity too, but that's
out of the scope for this quick fix.

Signed-off-by: Gergely Nagy <[email protected]>

Dockerfile

@@ -20,7 +20,7 @@ RUN apt-get install --no-install-recommends -y build-essential \
 RUN apt-get clean
 RUN rm -rf /var/lib/apt/lists/*
 
-ENV keyboard=ergodox_ez
+ENV keyboard=ergodox
 ENV keymap=default
 
 VOLUME /qmk