Cleanup the build tools and guide directories

In this PR, we have some changes for the build guides and deploy tools.
Including:

- Rename `readmes/*` -> `deploy/build/*`
- Rename `hooks/*` -> `src/tools/hooks/*`
- Move `python-dependencies.txt` to the top dir
- Move `README.Conda.md` out from the main repo to the
  `cloudberrydb/cloudberrydb-site` repo because it's for the data
  analytics guide, not how to build a Cloudberry Database.

Note that we have not verified the files in `deploy/vagrant`,
`deploy/docker`, and `deploy/k8s`. We cannot make sure it can run
successfully. We will do that in the following months.

README.md

@@ -50,7 +50,7 @@ Database.
 
 ### Build from source
 
-You can follow [these guides](./readmes) to build the Cloudberry Database on
+You can follow [these guides](./deploy/build) to build the Cloudberry Database on
 Linux OS(including CentOS, RHEL/Rocky Linux, and Ubuntu) and macOS.
 
 ### Try out quickly

readmes/README.Linux.md → deploy/build/README.Linux.md

@@ -30,10 +30,10 @@ Enter the repository and install dependencies according to your operating system
 
 The following steps work on CentOS 7. For other CentOS versions, these steps might work but are not guaranteed to work.
 
-1. Run the bash script `README.CentOS.bash` in the `readmes` directory of the `cloudberrydb/cloudberrydb` repository. To run this script, password is required. Then, some required dependencies will be automatically downloaded.
+1. Run the bash script `README.CentOS.bash` in the `deploy/build` directory of the `cloudberrydb/cloudberrydb` repository. To run this script, password is required. Then, some required dependencies will be automatically downloaded.
 
     ```bash
-    cd cloudberrydb/readmes
+    cd cloudberrydb/deploy/build
     ./README.CentOS.bash
     ```
 
@@ -81,16 +81,16 @@ The following steps work on CentOS 7. For other CentOS versions, these steps mig
 3. Install more dependencies by running the `README.Rhel-Rocky.bash` script.
 
     ```bash
-    ~/cloudberrydb/readmes/README.Rhel-Rocky.bash
+    ~/cloudberrydb/deploy/build/README.Rhel-Rocky.bash
     ```
 
 ### For Ubuntu 18.04 or later
 
-1. Install dependencies by running the `README.Ubuntu.bash` script in the `readmes` directory.
+1. Install dependencies by running the `README.Ubuntu.bash` script in the `deploy/build` directory.
 
     ```shell
     # You need to enter your password to run.
-    sudo ~/cloudberrydb/readmes/README.Ubuntu.bash
+    sudo ~/cloudberrydb/deploy/build/README.Ubuntu.bash
     ```
 
     > [!Note]

readmes/README.macOS.md → deploy/build/README.macOS.md

@@ -9,7 +9,7 @@ According to our test, these steps work well on macOS Ventura 13.4+ with both In
 Run the following command to install the needed dependencies. You will be asked to enter the `sudo` password of your macOS system.
 
 ```bash
-source readmes/README.macOS.bash
+source deploy/build/README.macOS.bash
 ```
 
 > [!NOTE]
@@ -66,7 +66,7 @@ source $(cd ~; pwd)/install/cbdb/greenplum_path.sh
 
 # 4. Install the Python dependencies.
 
-pip3 install --user -r readmes/python-dependencies.txt
+pip3 install --user -r python-dependencies.txt
 
 # 5. Start a demo cluster.
 

readmes/README.md → deploy/build/README.md

@@ -5,8 +5,8 @@ Greenplum Database READE.md here. Thanks all the original writers.-->
 
 This guides describes how to build Cloudberry Database from source code.
 
-- For building on Linux systems, see [Compile and Install Cloudberry Database on Linux](/readmes/README.Linux.md).
-- For building on macOS system, see [Compile and Install Cloudberry Database on macOS](/readmes/README.macOS.md).
+- For building on Linux systems, see [Compile and Install Cloudberry Database on Linux](./README.Linux.md).
+- For building on macOS system, see [Compile and Install Cloudberry Database on macOS](./README.macOS.md).
 
 ## Build the database
 
@@ -98,7 +98,7 @@ make distclean
 
 PXF is an extension framework for Greenplum Database/Cloudberry
 Database to enable fast access to external Hadoop datasets. Refer to
-[PXF extension](../gpcontrib/pxf/README.md) for more information.
+[PXF extension](../../gpcontrib/pxf_fdw/README.md) for more information.
 
 Currently, CBDB is built with PXF by default (--enable-pxf is on).
 In order to build CBDB without pxf, simply invoke `./configure` with additional option `--disable-pxf`.
@@ -108,9 +108,9 @@ PXF requires curl, so `--enable-pxf` is not compatible with the `--without-libcu
 
 Cloudberry Database supports Python3 with plpython3u UDF
 
-See [how to enable Python3](../src/pl/plpython/README.md) for details.
+See [how to enable Python3](../../src/pl/plpython/README.md) for details.
 
 
 # Development with Vagrant
 
-There is a Vagrant-based [quickstart guide for developers](../src/tools/vagrant/README.md).
+There is a Vagrant-based [quickstart guide for developers](../vagrant/README.md).