Feedback changes

Feedback: 

Home -
  - Keep heading font weight consistent, in some places it's regular and in some it's bold(companies that trust us and rest of the headings)
  - There's one JS error in console(https://cl.ly/0t0F3q2G1V1X/Image%2525202018-08-16%252520at%25252013.15.52.png)
  - There's some issue with mobile nav dropdown when height of browser is less(https://cl.ly/2c2I2N0E3T36)

Services Main - 
  - Update text(https://cl.ly/3p3k2Z0e2A1i)

Ruby on rails page - 
  - Remove white background from this section(https://cl.ly/0n2V2B0L450R)
  - Fix image and text alignment(https://cl.ly/0a2i1C1j2M3o)
  - Add space around section on small screens(https://cl.ly/3u2Z1u2D2U0d)
  - Add some spacing(https://cl.ly/2w0W0U3X3t3E)

React Native page - 
  - Add spacing as per wireframe(https://cl.ly/1T063J0w3j3u)
  - Fix text alignment(https://cl.ly/3B0F2Y0k100T)
  - Fix spacing(https://cl.ly/2Q1B42381M46)

Video series page -
  - Fix text overflow and time text alignment(https://cl.ly/2p110X2A0A2o)
  - Fix hover effect

Books page - 
  - Missing section background(https://cl.ly/3C3T0v2R1u1m)

Contact page - 
  - Make email block a link(https://cl.ly/2Q220c2Q1Z0X)
  - Missing block shadow(https://cl.ly/2O1W3A2S3P1E)