build: Add generic rule for PHP sources

Issue #38.
Add prototype advanced search page

Issue #38.
advanced: Add search header

Issue #38.
advanced: Add placeholder text

Issue #38.
search: Use right margin on logo

Issue #38.
search: Reduce logo text size

Issue #38.
search: Align search bar components

Issue #38.
build: Compiled CSS sources depend on all .less files
advanced: Remove inline search

Issue #38.
advanced: Add a couple of rows of input

Issue #38.
advanced: Fix inline search alignment

Issue #38.
less: Combine all Less CSS sources into styles.css

Issue #38.
www: Implement prototype advanced page

This adds a static mockup for the advanced search page.

Issue #38.
www: Link to advanced search page

Issue #38.