chore(README): Add missing addon images

bf42f3ae · Griefed · 6afe3e62 · bf42f3ae · bf42f3ae · bf42f3ae
Verified Commit bf42f3ae authored 2 years ago by Griefed
--- a/img/configcheck.png
+++ b/img/configcheck.png
--- a/img/configpanel.png
+++ b/img/configpanel.png
--- a/img/postgen.png
+++ b/img/postgen.png
--- a/img/pregen.png
+++ b/img/pregen.png
--- a/img/prezip.png
+++ b/img/prezip.png
--- a/img/tabextension.png
+++ b/img/tabextension.png