Remove old repo-smith supports

Remove old repo-smith integration tests

Remove old repo-smith unit tests

Clean up README

Remove specification

No longer require it since we're not maintaining the specification.

Documentation should come in the form of docstrings now.

Fix new repo-smith unit tests

Author: woojiahao

README.md

@@ -1,61 +1,9 @@
 # repo-smith
 
-YAML-based configuration for Git repository initialization for unit testing
+Declarative syntax for initializing Git repositories.
 
 ## Installation
 
 ```bash
 pip install -U repo-smith
 ```
-
-## Usage
-
-Create a new configuration file (following the [specification](/specification.md)).
-
-```yml
-# File path: tests/specs/basic_spec.yml
-name: Basic spec
-description: Starting basic spec
-initialization:
-  steps:
-    - name: Create filea.txt
-      type: new-file
-      filename: filea.txt
-      contents: |
-        Hello world
-    - name: Add filea.txt
-      type: add
-      files:
-        - filea.txt
-    - name: Initial commit
-      type: commit
-      message: Initial commit
-      id: initial-commit
-    - name: v0 tag
-      type: tag
-      tag-name: v0
-```
-
-Create a unit test accordingly.
-
-```py
-from repo_smith.initialize_repo import initialize_repo
-from git import Repo
-
-def test_dummy():
-  repo_initializer = initialize_repo("test/specs/basic_spec.yml")
-  with repo_initializer.initialize() as repo:
-    # All unit testing code for the dummy repository goes here
-    print(repo)
-```
-
-For more use cases of `repo-smith`, refer to:
-
-- [Official specification](/specification.md)
-- [Unit tests](./tests/)
-
-## FAQ
-
-### Why don't you assign every error to a constant and unit test against the constant?
-
-Suppose the constant was `X`, and we unit tested that the error value was `X`, we would not capture any nuances if the value of `X` had changed by accident.