Add search bar for filtering flags in home page

[yosyad]

Description

I added a search bar that can help to find a flag throw a big number of flags on the home page.

Motivation and Context

When the usage of flagr grows, I tend to add more flags for every configuration I have. By doing that, I affect directly the length of the list of flags on the home page. I was trying to suggest a new way to navigate throw all the flags easily.

How Has This Been Tested?

Tested locally, manually.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #268 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #268   +/-   ##
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  Coverage   81.76%   81.76%           
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  Files          26       26           
  Lines        1530     1530           
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  Hits         1251     1251           
  Misses        210      210           
  Partials       69       69

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[zhouzhuojie]

Hey, this is GREAT!

I've wanted to do something like the search for a while, but didn't decide which way to go, client side or server side search for the UI?

The advantage of server side search is that we get the limit/offset pagination upfront to be scalable into huge amount of flags. And client side search for its simplicity.

[yosyad]

I don't know if flagr home page is a good case for pagination and server side filtering, since I cant see a use case of too many flags (more than 1000?).
I guess that there are a lot of ways we can manage huge amount of flags, for example by grouping them or other approach. In my opinion this is a good start that we can continue with, maybe if will be a future requests from other users, we could implement a more sophisticated solution, such as server side filtering or even pagination. Please share your thoughts.

[zhouzhuojie]

is it possible to make it a substring search instead of just startsWith? At least, the search should be as good as cmd+f from the browser. This is equivalent to "description_like" params, so we can easily migrate the search box to server-side search in the future (if it's necessary).

[yosyad]

@zhouzhuojie Alright, done.