Changes API for fetching tweets

[agbilotia1998]

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.

Short description of what this resolves:

Changes API for fetching tweets, which provides only the tweets made by the organizer and also shows response with the retweets made.

Link to server: https://webapp-generator.herokuapp.com/
Test endpoint:

• https://eventyay.com/api/v1/events/200

Fixes #2017

[agbilotia1998]

The proposed solution is an alternative to loklak API. I checked the documentation of the search API but either all the tweets(Also not by the organizer - #1363) or only specific tweets(Not including the retweets - https://sched.eventyay.com/GoogleIO2017/ and http://2018.fossasia.org/ [Current implemetation]) are sent as the response. If there is any other solution or configuration to existing solution that can be made please let me know. Please review @geekyd @shubham3211 @pradeepgangwar

[codecov]

Codecov Report

Merging #2021 into development will not change coverage.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           development    #2021   +/-   ##
============================================
  Coverage        72.07%   72.07%           
============================================
  Files                9        9           
  Lines             2328     2328           
  Branches           412      412           
============================================
  Hits              1678     1678           
  Misses             650      650

Impacted Files	Coverage Δ
src/backend/gulpfile.js	74.54% <100%> (ø)	⬆️

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[mariobehling]

The goal is to keep the loklak API.