Modify the install and initialise steps

[zabil]

On https://preview.gauge.taiko/gauge-taiko

• Use bash and not zsh
• Get rid of the warning dyld library not loaded on top
• Start executing the commands in the $HOME folder. i.e switch to $HOME folder before recording the video using cd
• Use the following set of commands

$ node --version
$ npm install -g @getgauge/cli
$ mkdir test; cd test
$ gauge init js

Change the command on this section

from npm install @getgauge/cli npm install -g @getgauge/cli

[zabil]

Also modify the copy on this page to
"Gauge and Taiko are simple to set up. Start with a sample project using these commands"