Make topos more discoverable

[d21d3q]

Great project, but I'm struggling to use it as topo. If I am browsing map to find some climbing area I can see that there are many routes added, but I can't distinguish if there is any topo for them. Sometimes there is area that is partially with topo. But one needs to click through lots of links to find if there is anything usefull.
Logging ascent is secondary feature (for now I am using 8a.nu to log ascents, but at home after climbing)

Proposed solutions (features):

• add filtering to the map which will show only routes that have topo
• make alternative frontend that will be topo focused - without non-topo features, lightweight (so that it works on mobile with bad connection in the field).