Improve Search Algorithm

[ijemmao]

Describe your changes

• No longer passing the search word through the expandNoun helper function. This helper function has been leading to a lot of false matches which confuses end users and ultimately lowers their trust in the quality of the platform.
• Removed letter N in M regexes - there was a copy and paste mistake where if a user's search word included the letter m (case insensitive) then the generated wordReg, definitionsReg, and examplesReg would not only include the letter m but also the letter m in the regexes, which led to a lot of false matches.

Issue ticket number and link

Closed #785

Motivation and Context

Recently the quality of search has been pretty low.

How Has This Been Tested?

Ran all unit tests locally and updated stale tests.

Screenshots (if appropriate):

N/A

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Name	Status	Preview	Comments	Updated (UTC)
igbo-api	❌ Failed (Inspect)			Jun 16, 2024 6:01pm