[Performane] : Fix slow loading of Music Blocks on all the browsers (#4331)

* chore: format index.html

* perf: add header links in optimized order

* perf: fix large-layout-shift and render-blocking issues

* chore: re-format the index.html file

* fix: fix the alignment of the video

* feat: use http-server instead of SimpleHTTPServer for Keep-Alive functionality

* perf: add gzip and brotli for text compression

* perf: add express server for efficient loading

* perf: reduce lcp time

* fix: fix show the loading text

* chore: update package-lock.json

Author: apsinghdev

README.md

@@ -96,47 +96,18 @@ CLI_), on your local machine.
 2. In a terminal, `cd` to the directory where you downloaded/cloned
 Music Blocks, using `cd path/to/musicblocks/`.
 
-3. If you do not have [_Python_](https://www.python.org) installed,
-you'll need to install it.  You can test for Python in a terminal
-using `python`. Type `exit()` to exit Python. (Note that on some older
-Linux systems, the `python3` command is not bound to python. You may
-need to perform a `sudo apt install python-is-python3` on Debian-like
-distros, or equivalent on others.)
-
-4. After cloning the musicblocks repository, you can choose one of two methods to start a local server: using Python or using npm
-
-   **Using Python**
-
-   for _Linux_ and _macOS_:
-
-    ```bash
-    python -c "import os, sys; os.system('python -m SimpleHTTPServer 3000 --bind 127.0.0.1') if sys.version_info.major==2 else os.system('python -m http.server 3000 --bind 127.0.0.1')"
-    ```
-
-    for _Windows_:
+3. After you are in `path/to/musicblocks/` directory, install the dependencies using the following command
 
     ```bash
-    python -c "import os, sys; os.system('python -m SimpleHTTPServer 3000') if sys.version_info.major==2 else os.system('python -m http.server 3000 --bind 127.0.0.1')"
+    npm install
     ```
 
-
-    **Using npm**
-
-    for _Linux_ and _macOS_:
+4. After cloning the musicblocks repository, you can start a local server using npm
 
     ```bash
-    npm run serve
+    npm run dev
     ```
 
-    for _Windows_:
-
-    ```bash
-    npm run winserve
-    ```
-
-    **NOTE:** _Make sure you can run either `python` or `py` from your
-    terminal, to launch the Python prompt._
-
 6. You should see a message `Serving HTTP on 127.0.0.1 port 3000
 (http://127.0.0.1:3000/) ...` since the HTTP Server is set to start
 listening on port 3000.