Improve bash_alias update process

[ghost]

Currently you need to manually remove commands from bash_aliases for it to be re-created. The intention was to stop duplicate commands being set up.

We should be able to fix this update process issue and retain the no-duplicates aim by adding the following command before we set up new aliases: sed -i '/randpw() { for i in/d' ~/.bash_aliases

[dogsbody]

Would prefer if we used sed -i '/^randpw() /d' ~/.bash_aliases as it doesn't assume the way that the old alias is setup.

[ghost]

Yep I suggest we base the sed line off of the grep commands.

For whoever picks this up, these are the jobs that need doing off of this:

• alias removal commands set up for all aliases. Including the following commands:
  • markdown
  • to_uuid
  • randpw
  • from_epoch
  • html_character_parser
  • slackpretty
  • musicpi
• Remove grep -q -F as it is now redundant