Write the name in lowercase where people see it

The brand is lowercase inbuxa. This changes the setup wizard's welcome and
completion text, the logo's accessible name, the version line in the top bar,
the document title, the legacy-protocols screens and banner, the protocol
table's JMAP row, one help text, and the issuer new authenticator enrollments
are labeled with.

Keys are ids here, not English text, so nothing moved: each catalog value and
its inline fallback changed together. This console ships English only, so
there is no other catalog to follow. Comments, identifiers and env var names
are untouched.

src/help/texts.ts

@@ -104,7 +104,7 @@ export const PAGE_HELP: Record<string, PageHelp> = {
     about: 'Named sets of permissions. Give a role to a person to let them do more, or less.',
   },
   'x:OAuthClient': {
-    about: 'Apps allowed to sign people in through this server, like INBUXA webmail and INBUXA Admin.',
+    about: 'Apps allowed to sign people in through this server, like inbuxa webmail and inbuxa Admin.',
   },
   'x:DkimSignature': {
     about: 'The keys that sign outgoing mail so receivers can check it really came from you.',