Migrate the pypi package to khoj project name. Update references

- Deprecate khoj-assistant pypi package. Use more accurate and
  succinct pypi project name, khoj
- Update references to sye khoj pypi package in docs and code instead
  of the legacy khoj-assistant pypi package
- Update pypi workflow to publish to both khoj, khoj-assistant for now
- Update stale python 3.9 support mentioned in our pyproject. Can't
  support python 3.9 as depend on latest django which support >=3.10

documentation/docs/advanced/authentication.md

@@ -41,7 +41,7 @@ To set up your self-hosted Khoj with Google Auth, you need to create a project i
 To implement this, you'll need to:
 1. You must use the `python` package or build from source, because you'll need to install additional packages for the google auth libraries (`prod`). The syntax to install the right packages is
    ```
-   pip install khoj-assistant[prod]
+   pip install khoj[prod]
    ```
 2. [Create authorization credentials](https://developers.google.com/identity/sign-in/web/sign-in) for your application.
 3. Open your [Google cloud console](https://console.developers.google.com/apis/credentials) and create a configuration like below for the relevant `OAuth 2.0 Client IDs` project:

documentation/docs/contributing/development.mdx

@@ -229,7 +229,7 @@ The core code for the Obsidian plugin is under `src/interface/obsidian`. The fil
 4. Open the `khoj` folder in the file explorer that opens. You'll see a file called `main.js` in this folder. To test your changes, replace this file with the `main.js` file that was generated by the development server in the previous section.
 
 ## Create Khoj Release (Only for Maintainers)
-Follow the steps below to [release](https://github.com/debanjum/khoj/releases/) Khoj. This will create a stable release of Khoj on [Pypi](https://pypi.org/project/khoj-assistant/), [Melpa](https://stable.melpa.org/#%252Fkhoj) and [Obsidian](https://obsidian.md/plugins?id%253Dkhoj). It will also create desktop apps of Khoj and attach them to the latest release.
+Follow the steps below to [release](https://github.com/debanjum/khoj/releases/) Khoj. This will create a stable release of Khoj on [Pypi](https://pypi.org/project/khoj/), [Melpa](https://stable.melpa.org/#%252Fkhoj) and [Obsidian](https://obsidian.md/plugins?id%253Dkhoj). It will also create desktop apps of Khoj and attach them to the latest release.
 
 1. Create and tag release commit by running the bump_version script. The release commit sets version number in required metadata files.
   ```shell

documentation/docs/get-started/setup.mdx

@@ -105,10 +105,10 @@ Run the following command in your terminal to install the Khoj server.
     <TabItem value="macos" label="MacOS">
     ```shell
 # ARM/M1+ Machines
-MAKE_ARGS="-DLLAMA_METAL=on" python -m pip install khoj-assistant
+MAKE_ARGS="-DLLAMA_METAL=on" python -m pip install khoj
 
 # Intel Machines
-python -m pip install khoj-assistant
+python -m pip install khoj
     ```
     </TabItem>
     <TabItem value="win" label="Windows">
@@ -122,19 +122,19 @@ python -m pip install khoj-assistant
  $env:CMAKE_ARGS = "-DLLAMA_VULKAN=on"
 
  # 2. Install Khoj
- py -m pip install khoj-assistant
+ py -m pip install khoj
       ```
     </TabItem>
     <TabItem value="unix" label="Linux">
       ```shell
  # CPU
- python -m pip install khoj-assistant
+ python -m pip install khoj
  # NVIDIA (CUDA) GPU
- CMAKE_ARGS="DLLAMA_CUDA=on" FORCE_CMAKE=1 python -m pip install khoj-assistant
+ CMAKE_ARGS="DLLAMA_CUDA=on" FORCE_CMAKE=1 python -m pip install khoj
  # AMD (ROCm) GPU
- CMAKE_ARGS="-DLLAMA_HIPBLAS=on" FORCE_CMAKE=1 python -m pip install khoj-assistant
+ CMAKE_ARGS="-DLLAMA_HIPBLAS=on" FORCE_CMAKE=1 python -m pip install khoj
  # VULCAN GPU
- CMAKE_ARGS="-DLLAMA_VULKAN=on" FORCE_CMAKE=1 python -m pip install khoj-assistant
+ CMAKE_ARGS="-DLLAMA_VULKAN=on" FORCE_CMAKE=1 python -m pip install khoj
       ```
     </TabItem>
   </Tabs>
@@ -257,7 +257,7 @@ Set the host URL on your clients settings page to your Khoj server URL. By defau
   <Tabs groupId="environment">
     <TabItem value="localsetup" label="Local Setup">
       ```shell
-      pip install --upgrade khoj-assistant
+      pip install --upgrade khoj
       ```
       *Note: To upgrade to the latest pre-release version of the khoj server run below command*
     </TabItem>
@@ -285,7 +285,7 @@ Set the host URL on your clients settings page to your Khoj server URL. By defau
     <TabItem value="localsetup" label="Local Setup">
     ```shell
     # uninstall khoj server
-    pip uninstall khoj-assistant
+    pip uninstall khoj
 
     # delete khoj postgres db
     dropdb khoj -U postgres
@@ -318,13 +318,13 @@ Set the host URL on your clients settings page to your Khoj server URL. By defau
   1. Install [pipx](https://pypa.github.io/pipx/#install-pipx)
   2. Use `pipx` to install Khoj to avoid dependency conflicts with other python packages.
      ```shell
-     pipx install khoj-assistant
+     pipx install khoj
      ```
   3. Now start `khoj` using the standard steps described earlier
 
 
 #### Install fails while building Tokenizer dependency
-- **Details**: `pip install khoj-assistant` fails while building the `tokenizers` dependency. Complains about Rust.
+- **Details**: `pip install khoj` fails while building the `tokenizers` dependency. Complains about Rust.
 - **Fix**: Install Rust to build the tokenizers package. For example on Mac run:
     ```shell
     brew install rustup