Move pages under tldr, lint run.sh, update docs

tldr/git-mergetool

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git mergetool
+
+> Run merge conflict resolution tools to resolve merge conflicts.
+> More information: <https://git-scm.com/docs/git-mergetool>.
+
+- Launch the default merge tool to resolve conflicts:
+
+`git mergetool`
+
+- List valid merge tools:
+
+`git mergetool --tool-help`
+
+- Launch the merge tool identified by a name:
+
+`git mergetool --tool {{tool_name}}`
+
+- Don't prompt before each invocation of the merge tool:
+
+`git mergetool --no-prompt`
+
+- Explicitly use the GUI merge tool (see the `merge.guitool` configuration variable):
+
+`git mergetool --gui`
+
+- Explicitly use the regular merge tool (see the `merge.tool` configuration variable):
+
+`git mergetool --no-gui`