dmd, ldc, gdc, dub: add page (#11321)

* dmd: Add page

* dmd: Update page

* ldc: Add page

* gdc: Add page

* dub: Add page

* ldc: Update page

* Update dmd.md

fix lint error

* Update dub.md

fix linter error

* Update gdc.md

fix linter error

* Update ldc.md

fix linter error

* Update pages/linux/dub.md

Co-authored-by: pixel <pixel+github@chrissx.de>

* Update pages/linux/gdc.md

Co-authored-by: pixel <pixel+github@chrissx.de>

* Update dmd.md

* dmd, dub, gdc, ldc: move to common

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* Update pages/common/dmd.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/dmd.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/dub.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/dub.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/dub.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/ldc.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/ldc.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/ldc.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/ldc.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Update pages/common/ldc.md

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* Apply suggestions from code review

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

* dmd, dub, gdc, ldc: update pages

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

* dub: fix typo

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>

---------

Signed-off-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: pixel <pixel+github@chrissx.de>
Co-authored-by: K.B.Dharun Krishna <kbdharunkrishna@gmail.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>

pages/common/dub.md

@@ -0,0 +1,28 @@
+# dub
+
+> Package manager for D packages.
+> More information: <https://dub.pm/commandline>.
+
+- Interactively create a new D project:
+
+`dub init {{project_name}}`
+
+- Non-interactively create a new D project:
+
+`dub init {{project_name}} -n`
+
+- Build and run a D project:
+
+`dub`
+
+- Install dependencies specified in a D project's `dub.json` or `dub.sdl` file:
+
+`dub fetch`
+
+- Update the dependencies in a D project:
+
+`dub upgrade`
+
+- Display help:
+
+`dub --help`