Remove unnecessary components

[jo-elimu]

Reduce code complexity by removing unnecessary components:

• Reduce code complexity #106
• Sunset Crowdsource app #134
  • Delete Platform enum webapp#1674
• Remove Google as sign-in option webapp#1651
• Remove integration with Google Cloud Text-to-Speech webapp#1667
• Reduce number of supported languages model#270
• Reduce number of supported languages webapp#1733
• Handle changes to available languages in newer versions of the model library analytics#156
• Handle changes to available languages in newer versions of the model library content-provider#131
• remove outdated config webapp#1755
• Parameter optimize is deprecated webapp#1805
• Remove maxFormContentSize webapp#1807
• Remove verbose parameter from jetty-jspc-maven-plugin webapp#1818
• Refactoring: Remove Multimedia class webapp#955
• Remove Javadoc plugin webapp#1802
• Remove custom fonts webapp#1878
• Remove androidId from database entities analytics#154
• Delete e-mail templates webapp#1898
• Remove /contributions/most-recent webapp#1912