LA tutorial issues

[biodataganache]

          Couple of items:

1. Please add a script in the Snekmer/resources/tutorial/learnapp_tutorial_files/ folder that will run the learn and apply examples (see Snekmer/resources/tutorial/demo_example/ for the idea).
2. Please remove the base file in the Snekmer/resources/tutorial/learnapp_tutorial_files/learn/ folder from the repo (this should be generated by running the example)
3. Please fix the following error when snekmer learn is run:
   /Users/d3p620/lib/Snekmer/resources/tutorial/learnapp_tutorial_files/learn

(snekmer) d3p620@WE48427 learn % snekmer learn
KeyError in line 914 of /Applications/anaconda3/envs/snekmer/lib/python3.10/site-packages/snekmer/rules/learn.smk:
'conf_weight_modifier'
File "/Applications/anaconda3/envs/snekmer/lib/python3.10/site-packages/snekmer/rules/learn.smk", line 914, in

Originally posted by @biodataganache in #115 (comment)

[jjacobson95]

Requested changes made with this commit.