Add baseURL for develop mode

[clyang82]

Add baseURL for hugo serve command to have http://localhost:1313/ instead of //localhost:1313/
Before Fix:
make serve

docker run -t -i --sig-proxy=true --rm -v /Users/clyang/go/src/istio.io/istio.io:/site -w /site -p 1313:1313 gcr.io/istio-testing/website-builder:2018-10-08 hugo serve --bind 0.0.0.0 --disableFastRender

                   | EN  | ZH   
+------------------+-----+-----+
  Pages            | 520 | 503  
  Paginator pages  |   0 |   0  
  Non-page files   | 122 | 119  
  Static files     |  56 |  56  
  Processed images |   0 |   0  
  Aliases          | 139 |   1  
  Sitemaps         |   2 |   1  
  Cleaned          |   0 |   0  

Total in 3563 ms
Watching for changes in /site/{assets,content,content_zh,data,i18n,layouts,static}
Watching for config changes in /site/config.toml
Serving pages from memory
Web Server is available at //localhost:1313/ (bind address 0.0.0.0)
Press Ctrl+C to stop

After Fix:

docker run -t -i --sig-proxy=true --rm -v /Users/clyang/go/src/istio.io/istio.io:/site -w /site -p 1313:1313 gcr.io/istio-testing/website-builder:2018-10-08 hugo serve --baseURL "http://localhost:1313/" --bind 0.0.0.0 --disableFastRender

                   | EN  | ZH   
+------------------+-----+-----+
  Pages            | 520 | 503  
  Paginator pages  |   0 |   0  
  Non-page files   | 122 | 119  
  Static files     |  56 |  56  
  Processed images |   0 |   0  
  Aliases          | 139 |   1  
  Sitemaps         |   2 |   1  
  Cleaned          |   0 |   0  

Total in 3690 ms
Watching for changes in /site/{assets,content,content_zh,data,i18n,layouts,static}
Watching for config changes in /site/config.toml
Serving pages from memory
Web Server is available at http://localhost:1313/ (bind address 0.0.0.0)
Press Ctrl+C to stop

Signed-off-by: clyang82 [email protected]

[istio-testing]

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[istio-testing]

Hi @clyang82. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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