Search improvements

[alexdln]

A bunch of minor improvements to the search (under development)

On the search page:

• keywords on cards should navigate to search in the format /search?q=name:package-name%20keywords:clicked-keyword;
• all filter and sort options should be disabled, incl. for table view;
• submitting a form (pressing Enter) should not cause the page to reload;
• area under keywords wrapper should be clickable (currently the entire width is not clickable, even if there is only one short one at the beginning)

On orgs page

• keywords on cards should filter packages list;
• filters and sorts should be reflected in the URL;

Both

• Active keywords should be highlighted and respond predictably

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