Standard installation instruction visibility (#979)

**Context:**
The standard (default, preferred) installation instructions in the
pennylane-lightning docs are easy to miss.
This could discourage users if they think they need to go through a more
involved installation process, ie. installing from source.

**Description of the Change:**
Added a heading for standard installation instructions.

**Benefits:**
Easier to notice the most simple/straightforward installation method for
lightning devices.

**Possible Drawbacks:**

**Related GitHub Issues:**

---------

Co-authored-by: Shuli Shu <08cnbj@gmail.com>
Co-authored-by: ringo-but-quantum <github-ringo-but-quantum@xanadu.ai>

.github/CHANGELOG.md

@@ -31,6 +31,9 @@
 
 ### Documentation
 
+* Update Lightning-Tensor installation docs and usage suggestions.
+  [(#979)](https://github.com/PennyLaneAI/pennylane-lightning/pull/979)
+
 ### Bug fixes
 
 * Fix issue with adjoint-jacobian of adjoint ops.
@@ -49,7 +52,7 @@
 
 This release contains contributions from (in alphabetical order):
 
-Ali Asadi, Joseph Lee, Luis Alfredo Nuñez Meneses, Andrija Paurevic, Shuli Shu, Raul Torres, Haochen Paul Wang
+Ali Asadi, Joseph Lee, Anton Naim Ibrahim, Luis Alfredo Nuñez Meneses, Andrija Paurevic, Shuli Shu, Raul Torres, Haochen Paul Wang
 
 ---
 

README.rst

@@ -77,9 +77,10 @@ The following table summarizes the supported platforms and the primary installat
 Lightning-Qubit installation
 ****************************
 
-Lightning-Qubit comes pre-installed with PennyLane. Please follow our 
-`installation instructions <https://pennylane.ai/install/#high-performance-computing-and-gpus>`_ 
-to install PennyLane.
+Standard installation
+=====================
+| **Lightning-Qubit comes pre-installed with PennyLane.**
+| Please follow our `installation instructions <https://pennylane.ai/install/#high-performance-computing-and-gpus>`_ to install PennyLane.
 
 Install from source
 ===================
@@ -204,7 +205,10 @@ The C++ code can be tested with
 Lightning-GPU installation
 **************************
 
-For the majority of cases, Lightning-GPU can be installed by following our installation instructions at `pennylane.ai/install <https://pennylane.ai/install/#high-performance-computing-and-gpus>`__.
+Standard installation
+=====================
+| For the majority of cases,
+| Lightning-GPU can be installed by following our installation instructions at `pennylane.ai/install <https://pennylane.ai/install/#high-performance-computing-and-gpus>`__.
 
 Install Lightning-GPU from source
 =================================
@@ -285,7 +289,10 @@ The C++ code is tested with
 Lightning-Kokkos installation
 *****************************
 
-On most Linux systems, Lightning-Kokkos can be installed via Spack or Docker by following our installation instructions at `pennylane.ai/install <https://pennylane.ai/install/#high-performance-computing-and-gpus>`__.
+Standard installation
+=====================
+| On most Linux systems,
+| Lightning-Kokkos can be installed via Spack or Docker by following our installation instructions at `pennylane.ai/install <https://pennylane.ai/install/#high-performance-computing-and-gpus>`__.
 
 Install Lightning-Kokkos from source
 ====================================
@@ -383,12 +390,10 @@ Lightning-Tensor requires CUDA 12 and the `cuQuantum SDK <https://developer.nvid
 The SDK may be installed within the Python environment ``site-packages`` directory using ``pip`` or ``conda`` or the SDK library path appended to the ``LD_LIBRARY_PATH`` environment variable.
 Please see the `cuQuantum SDK <https://developer.nvidia.com/cuquantum-sdk>`_ install guide for more information.
 
-Lightning-Tensor and ``cutensornet-cu12`` can be installed via:
-
-.. code-block:: bash
-    
-    pip install cutensornet-cu12
-    pip install pennylane-lightning-tensor
+Standard installation
+=====================
+| For the majority of cases,
+| Lightning-Tensor can be installed by following our installation instructions at `pennylane.ai/install <https://pennylane.ai/install/#high-performance-computing-and-gpus>`__.
 
 Install Lightning-Tensor from source
 ====================================

pennylane_lightning/core/_version.py

@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = "0.40.0-dev12"
+__version__ = "0.40.0-dev13"