Remove bluez and avahi-observe connection from Chip Tool instructions

[farshidtz]

These are now auto connected.

Related to https://github.com/canonical/chip-tool-snap/issues/56

Additionally affected pages:

• https://canonical-matter.readthedocs-hosted.com/en/latest/how-to/matter-and-thread-on-ubuntu/
• https://canonical-matter.readthedocs-hosted.com/en/latest/tutorial/pi-gpio-commander/

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Reported from: https://canonical-matter.readthedocs-hosted.com/en/latest/how-to/chip-tool-commission-and-control/*