perf: --depth=1 shallow clones for end users

- rather than cloning the entire history of repos, can do a shallow clone with a [depth](https://git-scm.com/docs/git-clone#Documentation/git-clone.txt-code--depthcodeemltdepthgtem) of 1
  - this should make it more efficient, particularly when there are many commits or many large commits
  - since the history is unused by regular end users, there is no need to fetch/download it

- could alternatively do a [bare](https://git-scm.com/docs/git-clone#Documentation/git-clone.txt-code--barecode) clone to be even more efficient
  - but I thought a shallow clone is a bit less intrusive for now
    - and is reversible, if needed (i.e. a local shallow clone can fetch the rest of the depth)

- also add syntax highlighting to the first code block, matching the second one

README.md

@@ -6,8 +6,8 @@ Script to add GApps and other stuff to Waydroid!
 
 ## Interactive terminal interface
 
-```
+```bash
-git clone https://github.com/casualsnek/waydroid_script
+git clone --depth=1 https://github.com/casualsnek/waydroid_script
 cd waydroid_script
 python3 -m venv venv
 venv/bin/pip install -r requirements.txt
@@ -25,7 +25,7 @@ sudo venv/bin/python3 main.py
 ## Command Line
 
 ```bash
-git clone https://github.com/casualsnek/waydroid_script
+git clone --depth=1 https://github.com/casualsnek/waydroid_script
 cd waydroid_script
 python3 -m venv venv
 venv/bin/pip install -r requirements.txt
@@ -65,7 +65,7 @@ Then launch waydroid with:
 
 After waydroid has finished booting, open terminal and switch to directory where "main.py" is located then run:
 
-    sudo venv/bin/python3 main.py certified
+    sudo python3 main.py google
 Copy the returned numeric ID, then open ["https://google.com/android/uncertified/?pli=1"](https://google.com/android/uncertified/?pli=1). Enter the ID and register it. Wait 10-20 minutes for device to get registered. Then clear Google Play Service's cache and try logging in!