PR #30860 added a one-shot Portal setup command and a small portal CLI
surface. Update the docs so the new commands are discoverable without
upgrading the tone of existing Portal mentions.
- getting-started/quickstart.md: small tip near Choose a Provider
pointing at 'hermes setup --portal' as the easiest fresh-install path.
- user-guide/features/tool-gateway.md: lead the Get-Started section
with 'hermes setup --portal' for fresh installs, keep 'hermes model'
for already-configured users, and add 'hermes portal status / tools'
to the activity-check commands.
- user-guide/features/{web-search,image-generation,tts,browser}.md: the
existing 'Nous Subscribers' tip blocks now name the one-shot command
for new installs, keeping the existing 'hermes tools' path for users
who only want to swap a single backend.
- reference/cli-commands.md: register 'hermes portal' in the top-level
command table, add a 'hermes portal' section with subcommands, and
add '--portal' to the 'hermes setup' options table.
Tone: each page already had a Portal mention. This PR keeps the per-page
count to one and uses concrete CLI commands rather than promotional copy.
Tool Gateway page is the one exception (the whole doc is about Portal).
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