Mcp server instructions update fix (RooCodeInc#3699)

* Refactor weather server example implementation inside of prompt to use new MCP SDK features

* update NPM install instructions as well

* docs: minor improvements

* refactor: improve readability on mcpHub check

* fix: add missing bracket

* refactor: add interfaces

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Co-authored-by: Daniel <57051444+daniel-lxs@users.noreply.github.com>

Author: nexon33