Quote titles in front matter

Or Quarto will complain in this manner:

> ERROR: YAMLError: incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line at line 2, column 33:
>     title: Large-scale Data Analysis: from Images to Science Paramet ...
>                                     ^
>
> Stack trace:
>     title: Large-scale Data Analysis: from Images to Science Paramet ...
>                                     ^
>     at generateError (file:///opt/quarto/bin/quarto.js:10480:12)
>     at throwError (file:///opt/quarto/bin/quarto.js:10483:11)
>     at readBlockMapping (file:///opt/quarto/bin/quarto.js:11075:24)
>     at composeNode (file:///opt/quarto/bin/quarto.js:11299:84)
>     at readDocument (file:///opt/quarto/bin/quarto.js:11413:5)
>     at loadDocuments (file:///opt/quarto/bin/quarto.js:11448:9)
>     at load (file:///opt/quarto/bin/quarto.js:11453:23)
>     at parse2 (file:///opt/quarto/bin/quarto.js:11463:12)
>     at parseWithNiceErrors (file:///opt/quarto/bin/quarto.js:19695:16)
>     at readYamlFromMarkdown (file:///opt/quarto/bin/quarto.js:19626:17)

index.md

@@ -34,7 +34,8 @@ This is the training overview:
 
 - XS 100: [Data collection, preparing input parameters, SPEC and CLI][xs100]
 - XS 101: [Basic / on-the-fly data analysis, viewing detector images][xs101]
-- XS 102: [Large-scale data analysis: from images to science parameters to interpretation][xs102]
+- XS 102: [Large-scale data analysis: from images to science
+  parameters to interpretation][xs102]
 - XS 200: [Metadata for data fidelity and systematic checks][xs200]
 
 ## Theme 5: Data Curation and FAIR

theme2/SF101/containers-and-virtualization.md

@@ -1,5 +1,5 @@
 ---
-title: Containers and Virtualization
+title: "Containers and Virtualization"
 author: ""
 date: ""
 ---

theme2/SF200/parallel-computing.md

@@ -1,5 +1,5 @@
 ---
-title: Parallel Computing Concepts
+title: "Parallel Computing Concepts"
 author: ""
 date: ""
 ---

theme2/SF201/batch-systems-and-compute-farms.md

@@ -1,5 +1,5 @@
 ---
-title: Batch Systems and Compute Farms
+title: "Batch Systems and Compute Farms"
 author: ""
 date: ""
 ---

theme4/XS102/large-scale-data-analysis.md

@@ -1,5 +1,5 @@
 ---
-title: Large-scale Data Analysis: from Images to Science Parameters to Interpretation
+title: "Large-scale Data Analysis: from Images to Science Parameters to Interpretation"
 author: ""
 date: ""
 ---

theme4/XS200/metadata.md

@@ -1,5 +1,5 @@
 ---
-title: Metadata for Data Fidelity and Systematic Checks
+title: "Metadata for Data Fidelity and Systematic Checks"
 author: ""
 date: ""
 ---