ARROW-1426: [Site] Fix the title of the top page.
ARROW-1426: [Site] Fix the title of the top page.

The <title> of the top page is empty because top.html has 2 <title> elements
and the 1st one is converted to empty element.

Author: Wataru Shimizu <waruzilla@gmail.com>

Closes #1006 from wagavulin/fix-top-page-title and squashes the following commits:

d3c30c7 [Wataru Shimizu] Fix the title of the top page.

cpcloud/arrow,apache/arrow,laurentgo/arrow,majetideepak/arrow,icexelloss/arrow,renesugar/arrow,xhochy/arrow,NonVolatileComputing/arrow,kou/arrow,siddharthteotia/arrow,laurentgo/arrow,pcmoritz/arrow,yufeldman/arrow,kou/arrow,kou/arrow,itaiin/arrow,tebeka/arrow,wagavulin/arrow,kou/arrow,laurentgo/arrow,tebeka/arrow,dremio/arrow,apache/arrow,icexelloss/arrow,pcmoritz/arrow,dremio/arrow,pcmoritz/arrow,itaiin/arrow,cpcloud/arrow,tebeka/arrow,siddharthteotia/arrow,tebeka/arrow,wagavulin/arrow,majetideepak/arrow,dremio/arrow,renesugar/arrow,wagavulin/arrow,tebeka/arrow,icexelloss/arrow,laurentgo/arrow,majetideepak/arrow,tebeka/arrow,itaiin/arrow,cpcloud/arrow,wagavulin/arrow,itaiin/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,kou/arrow,renesugar/arrow,yufeldman/arrow,dremio/arrow,tebeka/arrow,siddharthteotia/arrow,wesm/arrow,renesugar/arrow,cpcloud/arrow,majetideepak/arrow,laurentgo/arrow,wagavulin/arrow,yufeldman/arrow,xhochy/arrow,pcmoritz/arrow,icexelloss/arrow,wagavulin/arrow,laurentgo/arrow,xhochy/arrow,icexelloss/arrow,NonVolatileComputing/arrow,renesugar/arrow,itaiin/arrow,itaiin/arrow,kou/arrow,xhochy/arrow,wagavulin/arrow,renesugar/arrow,wesm/arrow,majetideepak/arrow,siddharthteotia/arrow,NonVolatileComputing/arrow,apache/arrow,siddharthteotia/arrow,icexelloss/arrow,apache/arrow,apache/arrow,apache/arrow,pcmoritz/arrow,xhochy/arrow,kou/arrow,NonVolatileComputing/arrow,siddharthteotia/arrow,kou/arrow,itaiin/arrow,yufeldman/arrow,NonVolatileComputing/arrow,siddharthteotia/arrow,wesm/arrow,cpcloud/arrow,renesugar/arrow,icexelloss/arrow,renesugar/arrow,icexelloss/arrow,wesm/arrow,renesugar/arrow,itaiin/arrow,xhochy/arrow,pcmoritz/arrow,yufeldman/arrow,cpcloud/arrow,kou/arrow,tebeka/arrow,xhochy/arrow,wesm/arrow,icexelloss/arrow,cpcloud/arrow,dremio/arrow,icexelloss/arrow,NonVolatileComputing/arrow,itaiin/arrow,wesm/arrow,apache/arrow,pcmoritz/arrow,laurentgo/arrow,laurentgo/arrow,itaiin/arrow,laurentgo/arrow,xhochy/arrow,kou/arrow,wagavulin/arrow,icexelloss/arrow,wesm/arrow,kou/arrow,itaiin/arrow,wagavulin/arrow,majetideepak/arrow,pcmoritz/arrow,NonVolatileComputing/arrow,xhochy/arrow,itaiin/arrow,renesugar/arrow,cpcloud/arrow,icexelloss/arrow,majetideepak/arrow,dremio/arrow,pcmoritz/arrow,wesm/arrow,renesugar/arrow,dremio/arrow,wesm/arrow,cpcloud/arrow,renesugar/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,itaiin/arrow,laurentgo/arrow,wagavulin/arrow,kou/arrow,cpcloud/arrow,wagavulin/arrow,wesm/arrow,siddharthteotia/arrow,renesugar/arrow,majetideepak/arrow,kou/arrow,apache/arrow,NonVolatileComputing/arrow,majetideepak/arrow,xhochy/arrow,xhochy/arrow,yufeldman/arrow,wesm/arrow,pcmoritz/arrow,xhochy/arrow,yufeldman/arrow,majetideepak/arrow,apache/arrow,NonVolatileComputing/arrow,cpcloud/arrow,yufeldman/arrow,siddharthteotia/arrow,pcmoritz/arrow,pcmoritz/arrow,dremio/arrow,renesugar/arrow,majetideepak/arrow,kou/arrow,yufeldman/arrow,renesugar/arrow,wesm/arrow,xhochy/arrow,wesm/arrow,cpcloud/arrow,apache/arrow,cpcloud/arrow,tebeka/arrow,apache/arrow,itaiin/arrow,apache/arrow,dremio/arrow,pcmoritz/arrow,icexelloss/arrow,majetideepak/arrow,pcmoritz/arrow,laurentgo/arrow,majetideepak/arrow,majetideepak/arrow,laurentgo/arrow,dremio/arrow,dremio/arrow,icexelloss/arrow,apache/arrow,xhochy/arrow,itaiin/arrow,wesm/arrow,wagavulin/arrow,yufeldman/arrow,majetideepak/arrow,laurentgo/arrow,NonVolatileComputing/arrow,yufeldman/arrow,tebeka/arrow,siddharthteotia/arrow,siddharthteotia/arrow,laurentgo/arrow,apache/arrow