gst-launch-1.0, gst-inspect-1.0: add page (#10524)

Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/gst-inspect-1.0.md

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+# gst-inspect-1.0
+
+> Print information on GStreamer plugins.
+> More information: <https://gstreamer.freedesktop.org/documentation/tools/gst-inspect.html?gi-language=c>.
+
+- Print information on a plugin:
+
+`gst-inspect-1.0 {{plugin}}`
+
+- List hardware transcoding capabilities of your device:
+
+`gst-inspect-1.0 {{vaapi|nvcodec}}`

pages/common/gst-launch-1.0.md

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+# gst-launch-1.0
+
+> Build and run a GStreamer pipeline.
+> More information: <https://gstreamer.freedesktop.org/documentation/tools/gst-launch.html?gi-language=c>.
+
+- Play test video in a window:
+
+`gst-launch-1.0 videotestsrc ! xvimagesink`
+
+- Play a media file in a window:
+
+`gst-launch-1.0 playbin uri={{protocol}}://{{host}}/{{path/to/file}}`
+
+- Re-encode a media file:
+
+`gst-launch-1.0 filesrc location={{path/to/file}} ! {{file_type}}demux ! {{codec_type}}dec ! {{codec_type}}enc ! {{file_type}}mux ! filesink location={{path/to/file}}`
+
+- Stream a file to an RTSP server:
+
+`gst-launch-1.0 filesrc location={{path/to/file}} ! rtspclientsink location=rtsp://{{host_IP}}/{{path/to/file}}`