Apply Luxoft style

Dependencies

• [2] 5LKTNB6O LOTS of progress
• [3] WYULWETJ Reorganize
• [4] S55XICBM Fix speaker notes
• [5] CBUCBYTV Progress
• [*] 6IUUMFCC Initial commit
• [*] UH3YXOLF Start the slide deck

Change contents

• edit in README.md at line 6
  [8.172]

  [8.172]
  +
• edit in README.md at line 8
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  + * Luxoft Tech Talk (podcast)
• file addition: luxoft-logo.png (----------)
  [8.29364678]
• replacement in sections/0-welcome.md at line 11
  [3.897]→[3.897:982](∅→∅)
  − <img data-src="img/logos/voxxed-days-athens.png" width="40%" class="no-background"/>
  [3.897]

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  + <img data-src="img/logos/luxoft-logo.png" width="15%" class="no-background"/>
• replacement in sections/3-the-browser-wars.md at line 123
  [2.4233917]→[2.4233917:4233954](∅→∅)
  − <code>prediction variable</code>
  [2.4233917]

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  + <code>prediction variable #4</code>