Add Qubes OS to list of operating systems.

Update README.md

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Added machine-learning-algorithms

Add more private search engines to the list

Added: 
- DuckDuckGo
- Swisscows
- Disconnect Search
- MetaGer

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A link to the HTTP response header database.

A curated list of all machine learning algorithms and deep learning algorithms grouped by category.

Add SpaceVim

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Removed the extra </p> tag

cheat.sh added in All-in-one Cheat sheet section

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I have added cheat.sh in All-in-one section. 
This link is very useful to get all-cheats in one place.

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- signed-off-by: Julien-Broyard <broyard.dev@gmail.com>

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Added 'mosh' and 'et' as SSH alternatives

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