Applescript run on relative path - path

Question

I'm running a quite stupid app, to clean my latex output files.
I'd like to place that app in every latex project i have, and be able to run that app. The app should detect its location based on where it is placed:
Ex: /Users/User/Documents/LatexProject1/clean.app to clean .../LatexProject1 Folder.
So far, I managed to run a script, based on absolute paths, which is quite annoying, having to change the app's path every time i run a new Latex project.
Can you help me to edit my code?
set subfolderOfSharedFolder to quoted form of "Users/lukas/Google Drive/006 semester/00_Bachelorarbeit/00_Documentation"
set response to display dialog "Trash all of the output files in your latex folder?" buttons {"Yes, I'm ready", "No"} default button 2 cancel button 2 with title "<subfolder name> Folder Prep" with icon caution
if button returned of response is "Yes, I'm ready" then
-- run spotlight search
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.lot c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.out c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.aux c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.blg c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.bbl c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.glg c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.glo c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.gls c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.idx c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.ist c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.lof c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.log c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.gz c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
-- run spotlight search 2
set filesToDelete to paragraphs of (do shell script "mdfind 'kMDItemFSName == *.toc c' -onlyin " & subfolderOfSharedFolder)
-- convert posix paths to file specifiers
repeat with thisFile in filesToDelete
set (contents of thisFile) to POSIX file thisFile
end repeat
tell application "Finder"
delete filesToDelete
end tell
if button returned of (display dialog "The APP files have been trashed." buttons {"OK"} default button 1 with title "SuchAndSuch Folder Prep" with icon 1) is "OK" then
end if
end if

Answer 1

"Path to me" gives the path to the script itself. Since you want the enclosing folder, you would use something like
tell application "Finder"
return folder of (path to me)
end tell
Edit to add: You would convert this line
set subfolderOfSharedFolder to quoted form of "Users/lukas/Google Drive/006 semester/00_Bachelorarbeit/00_Documentation"
to something like this:
tell application "Finder"
set subfolderOfSharedFolder to POSIX path of (folder of (path to me) as text)
end tell
assuming that you put the script you want to run in the folder "Users/lukas/Google Drive/006 semester/00_Bachelorarbeit/00_Documentation"