CLI install: add brew trust step for third-party tap

[nat hartman (nathartman)]

What

Adds brew trust viamrobotics/brews to the Homebrew install steps in the shared CLI install include (static/include/how-to/install-cli.md), which renders on the CLI overview page and every other page that reads it.

Why

Homebrew now requires third-party taps to be explicitly trusted before any of their formulae will load. The currently-documented sequence:

brew tap viamrobotics/brews
brew install viam

fails on an up-to-date Homebrew with:

Error: Refusing to load formula viamrobotics/brews/viam from untrusted tap viamrobotics/brews.

Trusting only the viam formula (brew trust --formula viamrobotics/brews/viam, which the error message suggests) is not enough — the install still fails on a dependency pulled from the same tap. Trusting the whole tap is what works.

Change

Insert brew trust viamrobotics/brews between the tap and install steps, in both Homebrew blocks (the macOS tab and the Linux x86_64 tab):

brew tap viamrobotics/brews
brew trust viamrobotics/brews
brew install viam

The Linux curl, Windows, and source-build tabs are unaffected.

Notes

• Draft — flagging for docs-team review of wording/placement.
• Editing the shared include is the single-source fix; no per-page edits needed.
• Verified against a real failed-then-fixed install on macOS (Homebrew tap-trust gate).

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[Ale Paredes (ale7714)]

🚀 ty!

[btshrewsbury-viam]

Heads-up: two brew blocks bypass this include and hit the same trust gate — the inline copy in docs/try/part-3.md and the viam-server one-liner in docs/reference/viam-server.md. Worth folding into this PR if you want one complete fix (a separate PR/issue for them, #5216/#5215, was closed as duplicate of this one).

[btshrewsbury-viam]

Pushed 4bcd7d7e3 adding the trust step to the two brew blocks that bypass the include, so this PR is now the complete fix: the inline CLI install copy in docs/try/part-3.md and the viam-server one-liner in docs/reference/viam-server.md (now brew tap ... && brew trust ... && brew install viam-server). The "older version of the Homebrew tap" section in viam-server.md needs no change: it only applies to users who already have the tap installed and trusted. prettier, markdownlint, vale, and make build-prod all pass locally.