Improve usability of examples

[francisanthony17]

within the example, the grid a star, there are 1 map and multiple traces, it might be confusing for new users as some of the trace layers might overlap and makes it not clear for users. it will be good to minimise it for 1 example to have 1 map and 1 trace.

[francisanthony17]

this is fixed in this commit 52fa55

with only the grid map and the grid astar trace is placed within the .workspace file

[spaaaacccee]

thanks @francisanthony17, this is merged in 2fa6564.

We'd like to ensure all first-party examples are good quality:

• In most cases, include one map and one search trace only
• In most cases, set the search trace to start playback from step 0