Add aliases

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• [x] alias cat='batcat --paging=never'
• [x] alias bat='batcat'

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Alternatively, alias like so:

mkdir -p ~/.local/bin
ln -s /usr/bin/batcat ~/.local/bin/bat

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• [x] alias clear='clear -x' (still allows scrolling up)

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• batcat linked when installed, via the second method
• keeping paging, because it's important for long files
• 'clear' alias put in bash_aliases