Add search relevance criteria to DBT search function

[stephen8chang]

Problem

In the DBT search function, search results are sorted in alphabetical order by the model name. This is not optimal for a search function, and can cause some difficulty for visibility of relevant search results for the user.

Solution

To solve this issue, this PR adds a "weight" criteria to each search result, which is an indication of how relevant it is to the user (the larger the number, the more relevant). To specify, weight will be added to a search result if the search query matches the name, tags, description, SQL code, or columns, whose weights are biggest to smallest in that respective order. Based on this, the order of the search results is sorted from the greatest to least "weight," and therefore allows for easier visibility of more relevant search results for the user.

Other Information

• Resolves Add search relevance criteria to DBT search function #112
• @Matt343 is also a collaborator on this PR

[jtcohen6]

Very nice! I agree with the motivation behind this change, and with the weights you've given so far.

I'm not sure if this is review-ready, so I'll just share that I took it for a spin and I've been running into an issue where the docs site is freezing. This happens any time, after having typed text into the search bar:

• when I press "x" to clear the search
• when I attempt to delete the last remaining letter in the search bar
• when I try to click on one of the search results

[stephen8chang]

@jtcohen6 Thanks for the catch. I inserted a conditional in the assignSearchRelevance function so these cases are taken care of.

[jtcohen6]

This is awesome, thanks for the contribution!