Template changes

Since my markdown templates use `Title` and the keyword for the filename
and my ReadingList template also used `Title` as a keyword, my
automations were getting confused.

I changed `Title` in the markdown template to `filename` to solve.

Also, I reverted my `poor man's surround` keybindings for an actual
plugin: `tpope/vim-surround`

.vim/templates/readinglist

@@ -1,8 +1,8 @@
 :insert
-* *Title*:
-* *Author*:
-* *Started*:
-* *Finished*:
+* *Title*: 
+* *Author*: 
+* *Started*: 
+* *Finished*: 
 * [Goodreads Link]()
 
 # Highlights / Notes