DOCS: move lstk setup instructions into the CLI

[joe4dev]

Replaces the Shell completions setup instructions with a pointer to lstk completion, which prints them itself.

Companion to localstack/lstk#495, which moves the instructions into the CLI: lstk completion prints them

PREVIEW:

• AWS lstk: https://devx-821-lstk-shell-completi.localstack-docs.pages.dev/aws/developer-tools/running-localstack/lstk/#shell-completions
• Azure lstk: https://devx-821-lstk-shell-completi.localstack-docs.pages.dev/azure/developer-tools/lstk/#shell-completions

What changed

The per-shell code tabs are gone. The section is now:

lstk includes completion scripts for bash, zsh, fish, and powershell.
If you installed via Homebrew, completions are set up automatically.

Run lstk completion to print setup instructions in your terminal.

Net effect across both pages: +2 / −101 lines.

Why

Pro: the CLI becomes the single source of truth. The same instructions currently live in three places — the CLI, this AWS page, and the Azure page — and they had already drifted. What was here recommended two zsh recipes that do not work (${fpath[1]} is root-owned on stock macOS; the Homebrew site-functions path is not on the built-in zsh's $fpath), omitted the required compinit step without which the zsh script fails with compdef: command not found, and had no PowerShell instructions at all. Pointing at the command removes the sync burden rather than fixing three copies and hoping they stay aligned.

Con: old versions can't be corrected. Instructions now ship with the binary, so a mistake reaches users until they upgrade — whereas a docs page can be fixed for everyone at once, including people on older releases.

Con: less pretty and less accessible. Terminal output has no tabbed code blocks, no copy button, and no syntax highlighting, and the instructions are no longer readable from the browser, searchable on the docs site, or linkable from elsewhere.

Docs ticket

https://linear.app/localstack/issue/DOC-455/docs-move-lstk-setup-instructions-into-the-cli

Related

lstk PR: localstack/lstk#495

Relevant discussion: localstack/lstk#495 (comment)

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