[tracker/sam/remove-design] docs: Remove outdated design/ docs

[Sam Thursfield <sthursfield src gnome org>]

commit d2be016fc4f3b8ae3e56de91256c0407fc6d006f
Author: Sam Thursfield <sam afuera me uk>
Date:   Thu May 27 19:44:44 2021 +0200

    docs: Remove outdated design/ docs
    
    This information is of a 10+ year vintage and relates mostly to Nokia
    N9 phones.
    
    See the website and https://gitlab.gnome.org/GNOME/tracker/-/merge_requests/436
    for more up to date information,

 docs/design/contentfw-structural-view.dot |  80 ------------------------------
 docs/design/tracker-miner-fs.dia          | Bin 6598 -> 0 bytes
 docs/design/tracker-store.dia             | Bin 4860 -> 0 bytes
 docs/design/tracker-structural-view.dot   |  39 ---------------
 4 files changed, 119 deletions(-)