tectonic: add page (#10532)

Co-authored-by: Jack Lin <blueskyson1401@gmail.com>
Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/tectonic.md

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+# tectonic
+
+> A modern, self-contained TeX/LaTeX engine.
+> More information: <https://tectonic-typesetting.github.io/book/latest>.
+
+- Compile a standalone TeX/LaTeX file:
+
+`tectonic -X compile {{path/to/file.tex}}`
+
+- Compile a standalone TeX/LaTeX file with synctex data:
+
+`tectonic -X compile --synctex {{path/to/file.tex}}`
+
+- Initialize a tectonic project in the current directory:
+
+`tectonic -X init`
+
+- Initialize a tectonic project in the specified directory:
+
+`tectonic -X new {{project_name}}`
+
+- Build the project in the current directory:
+
+`tectonic -X build`
+
+- Start a watcher to build the project in the current directory on change:
+
+`tectonic -X watch`