Don't open search links in a new window/tab

[pascalberger]

Don't open search links in a new window/tab.

If there's a possibility to access settings from docfx.json in the docfx.js file I could also implement it as a metadata switch.

Please also mention if you expect a test case for this.

#227

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[qinezh]

Just like @lidermanrony said in #227 , how could you resolve the issue that the back
button doesn't return you to search results after you clicked on a link in this way?

[pascalberger]

@qinezh That's a valid point and with the current implementation of the client search I don't see any quick workaround. Will close this PR as a consequence.