Remove "The" infection monkey

[mssalvatore]

What does this PR do?

Removes "the" in front of "infection monkey"

PR Checklist

• [ ] Have you added an explanation of what your changes do and why you'd like to include them?
• [ ] Is the TravisCI build passing?
• [ ] Was the CHANGELOG.md updated to reflect the changes?
• [ ] Was the documentation framework updated to reflect the changes?
• [ ] Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• [ ] Added relevant unit tests?
• [ ] Do all unit tests pass?
• [ ] Do all end-to-end tests pass?
• [ ] Any other testing performed?

  Tested by {Running the Monkey locally with relevant config/running Island/...}

• [ ] If applicable, add screenshots or log transcripts of the feature working

[mssalvatore]

@triciakickssaas Is this in line with your standards for Infection Monkey?

[mssalvatore]

I found a handful of other instances of "the Infection Monkey", in addition to our main README:

https://github.com/guardicore/monkey/blob/fff08b67bf7dea184497e9174573858563a451df/docs/content/usage/scenarios/network-breach.md?plain=1#L24

https://github.com/guardicore/monkey/blob/fff08b67bf7dea184497e9174573858563a451df/docs/content/usage/scenarios/other.md?plain=1#L9-L10

docs/layouts/shortcodes/homepage_shortcuts.html

https://github.com/guardicore/monkey/blob/fff08b67bf7dea184497e9174573858563a451df/monkey/infection_monkey/readme.md?plain=1#L59

https://github.com/guardicore/monkey/blob/fff08b67bf7dea184497e9174573858563a451df/monkey/monkey_island/docs/source/index.rst?plain=1#L29

Good finds. I'm not concerned about the index.rst.